Introduction Most of the applications require the data to be saved and loaded when it is

demanded As we see in games that whole game is saved and later on this is loaded again You

also want to store user preferences so that user may customize application and store data

entered by the user

Android Methods for saving data

Shared Preferences When you want a limited application data such as user preferences related

to application UI you prefer to store data using Shared Preferences In this method you store

data as key values pairs

Files In android you are allowed to create and readwrite to files You can create files on the

internal or external media of the device

SQLite Database Android also facilitates to work with relational database system The

Database system used in android is SQLite Database system

Content Provider Content Providers let you expose a well-defined interface for using and

sharing private data You can control access to Content Providers using the standard permission

system

Here we are going to discuss how SQLite database is used to save data in android Firstly letrsquos

have a brief introduction about SQLite database system

SQLite Database

SQLite database is a

Zero configuration (as it is default database provided embedded in android so no

configuration is required)

Lightweight ( requires minimum memory)

Open source (no license)

Single database file (Only one file is made against one database)

If an application creates a database it is stored in following directory

DATAdataAPP_NAMEdatabasesFILENAME

Before starting to work with database letrsquos discuss essential concepts which can help in

understanding the topic

1 SQL SQL is a structured query language that is used for database manipulation It

provides simple queries to create and manipulate database system Letrsquos start from data

retrieval using SQL

11 Select statement

Select statement is used to get data from database system The syntax of using

select statement is as follow

Select col1col2hellipcoln From TableName where some condition order by column

Eg select rollno from students where name=rsquoAsadrsquo

To get all columns of a table use as select from students

12 Data Definition

121 create table

This statement is used to create a new table if it does not exist The syntax is

as follow

CREATE TABLE newtable(

Col1 INT

Col2 VARCHAR(50)

col3 DATE NOT NULL

PRIMARY KEY (col1 col2)

)

Example create table users (uid int primary key password varchar(50))

122 Drop table

This statement is used to drop a table from database system if it exist

Syntax is as follow

Drop table tablename

Example drop table users

123 Alter table

Alter table statement is used to update table definition

Syntax is as follow

Update table tableName Add columnName type

Example Update table users Add age int

13 Data Manipulation

131 Insert statement

Insert statement is used to add records in database system

Syntax is as follow

Insert into tablename(col1col2hellipcoln) values(v1v2hellipvn)

Example insert into users(uidpassword) values(12rsquoabcd123rsquo)

132 Delete statement

Delet statement is used to delete records in database system

Syntax is as follow

Delete from tablename where somecondition

Example Delete from users where uid=12

Delete from users will delete all records from database

133 update statement

Update statement is used to update records in database system

Syntax is as follow

Update table tableName set col1=v1 where col2=v2

Example Update table users set password=rsquo6t8979rsquo where uid=12

2 Packages to use SQLite Database

Following packages are used to work with SQLite Database system

androiddatabase

androiddatabasesqlite

3 SQLiteopenHelper

To create and upgrade database in our application we need a class that extends

SQLiteOpenHelper class To use it we have to override two abstract methods onCreate()

and onUpgrade() SQLiteOpenHelper provides following methods

onCreat() this method is called when database does not exist

onUpgrade() this method allow you to update or alter database schema

getReadableDatabase() create orand open a database for only data reading

getWriteableDatabase()create orand open a database for both data reading and

writing

close() close the database if it is opened

onOpen() this method is called when a database is opened

4 ContentValues

ContentValues is a data structure used to store key and corresponding values Keys

represent columns in database and values are their values This is helpful for inserting

and updating records in database

5 SQLiteDataBase class

This is base class to work with database system This class has methods to manage

database It provides useful methods to insert a record delete a record and update a

record in a database All manipulation of database is done through this class Some most

commonly used methods of this class are given bellow

insert(String tableName String nullColumnHack ContentValues contentValues)

this method is used to insert a record in a database table

delete(String table String whereClause String[] whereArgs)

this method is used to delete a record from database table

update (String table ContentValues contentValuesString whereClause String[] whereArgs)

this method is used to delete a record from database table

this method is used to select records from database table and return cursor object we

will learn cursor a little bit later

ltExamplerawQuery(select from users where uid = new String[] id )

query(String table String[] columns String selection String[] Args String

groupByClause String havingClause String orderByClause String

NoOfRowsToBeFethed)

this method executes given query and return cursor object

6 Cursor

Cursor is just like ResultSet in java It contains all the records retrieved in form of result

of a query Cursor has number of methods to manipulate returned data Some of them

are as follow

MoveToNext() Move cursor to next record

MoveToPrevious() Move cursor to previous record

MoveToFirst() Move cursor to first record

MoveToLast() Move cursor to last record

MoveToPosition(int p) Move cursor to a record at given position

isFirst() Returns true if it is first record

isLast() Returns true if it is last record

getString(int columnIndex) Return String stored at given column of a row

getInt(int columnIndex) Return integer value stored at given column of a row

getDouble(int columnIndex) Return double value stored at given column of a row

Creating an application that explain working with database

In this example I have made 5 activities first is main activity and a DataBase helper class named

as DBCreator and a student class as Data Transfer Object(DTO) and a DAO class that interact with

database

1 SQL SQL is a structured query language that is used for database manipulation It

provides simple queries to create and manipulate database system Letrsquos start from data

retrieval using SQL

11 Select statement

Select statement is used to get data from database system The syntax of using

select statement is as follow

Select col1col2hellipcoln From TableName where some condition order by column

Eg select rollno from students where name=rsquoAsadrsquo

To get all columns of a table use as select from students

12 Data Definition

121 create table

This statement is used to create a new table if it does not exist The syntax is

as follow

CREATE TABLE newtable(

Col1 INT

Col2 VARCHAR(50)

col3 DATE NOT NULL

PRIMARY KEY (col1 col2)

)

Example create table users (uid int primary key password varchar(50))

122 Drop table

This statement is used to drop a table from database system if it exist

Syntax is as follow

Drop table tablename

Example drop table users

123 Alter table

Alter table statement is used to update table definition

Syntax is as follow

Update table tableName Add columnName type

Example Update table users Add age int

13 Data Manipulation

131 Insert statement

Insert statement is used to add records in database system

Syntax is as follow

Insert into tablename(col1col2hellipcoln) values(v1v2hellipvn)

Example insert into users(uidpassword) values(12rsquoabcd123rsquo)

132 Delete statement

Delet statement is used to delete records in database system

Syntax is as follow

Delete from tablename where somecondition

Example Delete from users where uid=12

Delete from users will delete all records from database

133 update statement

Update statement is used to update records in database system

Syntax is as follow

Update table tableName set col1=v1 where col2=v2

Example Update table users set password=rsquo6t8979rsquo where uid=12

2 Packages to use SQLite Database

Following packages are used to work with SQLite Database system

androiddatabase

androiddatabasesqlite

3 SQLiteopenHelper

To create and upgrade database in our application we need a class that extends

SQLiteOpenHelper class To use it we have to override two abstract methods onCreate()

and onUpgrade() SQLiteOpenHelper provides following methods

onCreat() this method is called when database does not exist

onUpgrade() this method allow you to update or alter database schema

getReadableDatabase() create orand open a database for only data reading

getWriteableDatabase()create orand open a database for both data reading and

writing

close() close the database if it is opened

onOpen() this method is called when a database is opened

4 ContentValues

ContentValues is a data structure used to store key and corresponding values Keys

represent columns in database and values are their values This is helpful for inserting

and updating records in database

5 SQLiteDataBase class

This is base class to work with database system This class has methods to manage

database It provides useful methods to insert a record delete a record and update a

record in a database All manipulation of database is done through this class Some most

commonly used methods of this class are given bellow

insert(String tableName String nullColumnHack ContentValues contentValues)

this method is used to insert a record in a database table

delete(String table String whereClause String[] whereArgs)

this method is used to delete a record from database table

update (String table ContentValues contentValuesString whereClause String[] whereArgs)

this method is used to delete a record from database table

this method is used to select records from database table and return cursor object we

will learn cursor a little bit later

ltExamplerawQuery(select from users where uid = new String[] id )

query(String table String[] columns String selection String[] Args String

groupByClause String havingClause String orderByClause String

NoOfRowsToBeFethed)

this method executes given query and return cursor object

6 Cursor

Cursor is just like ResultSet in java It contains all the records retrieved in form of result

of a query Cursor has number of methods to manipulate returned data Some of them

are as follow

MoveToNext() Move cursor to next record

MoveToPrevious() Move cursor to previous record

MoveToFirst() Move cursor to first record

MoveToLast() Move cursor to last record

MoveToPosition(int p) Move cursor to a record at given position

isFirst() Returns true if it is first record

isLast() Returns true if it is last record

getString(int columnIndex) Return String stored at given column of a row

getInt(int columnIndex) Return integer value stored at given column of a row

getDouble(int columnIndex) Return double value stored at given column of a row

Creating an application that explain working with database

In this example I have made 5 activities first is main activity and a DataBase helper class named

as DBCreator and a student class as Data Transfer Object(DTO) and a DAO class that interact with

database

Example Delete from users where uid=12

Delete from users will delete all records from database

133 update statement

Update statement is used to update records in database system

Syntax is as follow

Update table tableName set col1=v1 where col2=v2

Example Update table users set password=rsquo6t8979rsquo where uid=12

2 Packages to use SQLite Database

Following packages are used to work with SQLite Database system

androiddatabase

androiddatabasesqlite

3 SQLiteopenHelper

To create and upgrade database in our application we need a class that extends

SQLiteOpenHelper class To use it we have to override two abstract methods onCreate()

and onUpgrade() SQLiteOpenHelper provides following methods

onCreat() this method is called when database does not exist

onUpgrade() this method allow you to update or alter database schema

getReadableDatabase() create orand open a database for only data reading

getWriteableDatabase()create orand open a database for both data reading and

writing

close() close the database if it is opened

onOpen() this method is called when a database is opened

4 ContentValues

ContentValues is a data structure used to store key and corresponding values Keys

represent columns in database and values are their values This is helpful for inserting

and updating records in database

5 SQLiteDataBase class

This is base class to work with database system This class has methods to manage

database It provides useful methods to insert a record delete a record and update a

record in a database All manipulation of database is done through this class Some most

commonly used methods of this class are given bellow

insert(String tableName String nullColumnHack ContentValues contentValues)

this method is used to insert a record in a database table

delete(String table String whereClause String[] whereArgs)

this method is used to delete a record from database table

update (String table ContentValues contentValuesString whereClause String[] whereArgs)

this method is used to delete a record from database table

this method is used to select records from database table and return cursor object we

will learn cursor a little bit later

ltExamplerawQuery(select from users where uid = new String[] id )

query(String table String[] columns String selection String[] Args String

groupByClause String havingClause String orderByClause String

NoOfRowsToBeFethed)

this method executes given query and return cursor object

6 Cursor

Cursor is just like ResultSet in java It contains all the records retrieved in form of result

of a query Cursor has number of methods to manipulate returned data Some of them

are as follow

MoveToNext() Move cursor to next record

MoveToPrevious() Move cursor to previous record

MoveToFirst() Move cursor to first record

MoveToLast() Move cursor to last record

MoveToPosition(int p) Move cursor to a record at given position

isFirst() Returns true if it is first record

isLast() Returns true if it is last record

getString(int columnIndex) Return String stored at given column of a row

getInt(int columnIndex) Return integer value stored at given column of a row

getDouble(int columnIndex) Return double value stored at given column of a row

Creating an application that explain working with database

In this example I have made 5 activities first is main activity and a DataBase helper class named

as DBCreator and a student class as Data Transfer Object(DTO) and a DAO class that interact with

database

delete(String table String whereClause String[] whereArgs)

this method is used to delete a record from database table

update (String table ContentValues contentValuesString whereClause String[] whereArgs)

this method is used to delete a record from database table

this method is used to select records from database table and return cursor object we

will learn cursor a little bit later

ltExamplerawQuery(select from users where uid = new String[] id )

query(String table String[] columns String selection String[] Args String

groupByClause String havingClause String orderByClause String

NoOfRowsToBeFethed)

this method executes given query and return cursor object

6 Cursor

Cursor is just like ResultSet in java It contains all the records retrieved in form of result

of a query Cursor has number of methods to manipulate returned data Some of them

are as follow

MoveToNext() Move cursor to next record

MoveToPrevious() Move cursor to previous record

MoveToFirst() Move cursor to first record

MoveToLast() Move cursor to last record

MoveToPosition(int p) Move cursor to a record at given position

isFirst() Returns true if it is first record

isLast() Returns true if it is last record

getString(int columnIndex) Return String stored at given column of a row

getInt(int columnIndex) Return integer value stored at given column of a row

getDouble(int columnIndex) Return double value stored at given column of a row

Creating an application that explain working with database

In this example I have made 5 activities first is main activity and a DataBase helper class named

as DBCreator and a student class as Data Transfer Object(DTO) and a DAO class that interact with

database

Letrsquos start with class DBCreater code is given below

package commujadid001

import androidcontentContext

import androiddatabasesqliteSQLiteDatabase

import androiddatabasesqliteSQLiteDatabaseCursorFactory

import androiddatabasesqliteSQLiteOpenHelper

import androidutilLog

public class DBCreator extends SQLiteOpenHelper

constatns to refer database file table name and datbase version

public static final String student_TABLE_NAME = Student

public static final String DATABASE_NAME = studentsResultsdb

private static int DATABASE_VERSION = 1

constructor it only calls super class constructor

public DBCreator(Context context)

super(context DATABASE_NAME null DATABASE_VERSION)

TODO Auto-generated constructor stub

onCreat() method is called to create database first time

Override

public void onCreate(SQLiteDatabase db)

sql query to create a table

String sql = CREATE TABLE + student_TABLE_NAME + (studentId INTEGER

PRIMARY KEY AUTOINCREMENT studentName TEXTMarks INTEGER)

Logging a tag for debugging purposes

Logd(DATABASE_NAME oncreate+sql)

executing sql query

dbexecSQL(sql)

onupgrade() method definition

Override

public void onUpgrade(SQLiteDatabase db int oldVersion int newVersion)

sql query to drop an existing table normally here alter table query is written but it is

just an example

dbexecSQL(DROP TABLE IF EXISTS +student_TABLE_NAME + )

Logging a tag for debugging purpose

Logd(DATABASE_NAME onupdate)

now calling onCreate to create table again

onCreate(db)

Explaination

Constructor it is used to create an object of this class and call constructor of super class

onCreate() onCreate() is called by android framework when we call getWritableDatabase() or

getReadableDatbase() methods it is called when database file is not present

onUpgrade() it is called whenever a new version of datbase become available such that definition

of database is changed a new column has been added datatype of a column is changed etc

student Class

package commujadid001 public class student data memebers private int id private String Name public int marks constructors public student(String name int marks) Name = name thismarks = marks public student(int id String name int marks) super() thisid = id Name = name thismarks = marks setters and getters public int getId() return id public void setId(int id) thisid = id

public String getName() return Name public void setName(String name) Name = name public int getMarks() return marks public void setMarks(int marks) thismarks = marks

Explanation student class is self explanatory it has member variables getters setters

construtors

DAO CLASS

package commujadid001

import androidcontentContentValues

import androidcontentContext

import androiddatabaseCursor

import androiddatabasesqliteSQLiteDatabase

import androidutilLog

DAO class

public class DAO

an object of class SQLiteDatabase which have built in functions to manipulate database

SQLiteDatabase db

creating a reference of class DBCreator

DBCreator dbcreator

creating an object of type Context

Context context

constructor

public DAO(Context context)

initializing data members

dbcreator=new DBCreator(context)

getting writable datbase from class DBCreator this method is inherited in

DBCreator from its parent

db=dbcreatorgetWritableDatabase()

method to insert a record

public int InsertRecord(student s)

try

sql query to insert a record

String sql=inser+DBCreatorstudent_TABLE_NAME+(studentNameMarks)

values(+sgetName()++sgetMarks()+ )

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

onCreat() method is called to create database first time

Override

public void onCreate(SQLiteDatabase db)

sql query to create a table

String sql = CREATE TABLE + student_TABLE_NAME + (studentId INTEGER

PRIMARY KEY AUTOINCREMENT studentName TEXTMarks INTEGER)

Logging a tag for debugging purposes

Logd(DATABASE_NAME oncreate+sql)

executing sql query

dbexecSQL(sql)

onupgrade() method definition

Override

public void onUpgrade(SQLiteDatabase db int oldVersion int newVersion)

sql query to drop an existing table normally here alter table query is written but it is

just an example

dbexecSQL(DROP TABLE IF EXISTS +student_TABLE_NAME + )

Logging a tag for debugging purpose

Logd(DATABASE_NAME onupdate)

now calling onCreate to create table again

onCreate(db)

Explaination

Constructor it is used to create an object of this class and call constructor of super class

onCreate() onCreate() is called by android framework when we call getWritableDatabase() or

getReadableDatbase() methods it is called when database file is not present

onUpgrade() it is called whenever a new version of datbase become available such that definition

of database is changed a new column has been added datatype of a column is changed etc

student Class

package commujadid001 public class student data memebers private int id private String Name public int marks constructors public student(String name int marks) Name = name thismarks = marks public student(int id String name int marks) super() thisid = id Name = name thismarks = marks setters and getters public int getId() return id public void setId(int id) thisid = id

public String getName() return Name public void setName(String name) Name = name public int getMarks() return marks public void setMarks(int marks) thismarks = marks

Explanation student class is self explanatory it has member variables getters setters

construtors

DAO CLASS

package commujadid001

import androidcontentContentValues

import androidcontentContext

import androiddatabaseCursor

import androiddatabasesqliteSQLiteDatabase

import androidutilLog

DAO class

public class DAO

an object of class SQLiteDatabase which have built in functions to manipulate database

SQLiteDatabase db

creating a reference of class DBCreator

DBCreator dbcreator

creating an object of type Context

Context context

constructor

public DAO(Context context)

initializing data members

dbcreator=new DBCreator(context)

getting writable datbase from class DBCreator this method is inherited in

DBCreator from its parent

db=dbcreatorgetWritableDatabase()

method to insert a record

public int InsertRecord(student s)

try

sql query to insert a record

String sql=inser+DBCreatorstudent_TABLE_NAME+(studentNameMarks)

values(+sgetName()++sgetMarks()+ )

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

now calling onCreate to create table again

onCreate(db)

Explaination

Constructor it is used to create an object of this class and call constructor of super class

onCreate() onCreate() is called by android framework when we call getWritableDatabase() or

getReadableDatbase() methods it is called when database file is not present

onUpgrade() it is called whenever a new version of datbase become available such that definition

of database is changed a new column has been added datatype of a column is changed etc

student Class

package commujadid001 public class student data memebers private int id private String Name public int marks constructors public student(String name int marks) Name = name thismarks = marks public student(int id String name int marks) super() thisid = id Name = name thismarks = marks setters and getters public int getId() return id public void setId(int id) thisid = id

public String getName() return Name public void setName(String name) Name = name public int getMarks() return marks public void setMarks(int marks) thismarks = marks

Explanation student class is self explanatory it has member variables getters setters

construtors

DAO CLASS

package commujadid001

import androidcontentContentValues

import androidcontentContext

import androiddatabaseCursor

import androiddatabasesqliteSQLiteDatabase

import androidutilLog

DAO class

public class DAO

an object of class SQLiteDatabase which have built in functions to manipulate database

SQLiteDatabase db

creating a reference of class DBCreator

DBCreator dbcreator

creating an object of type Context

Context context

constructor

public DAO(Context context)

initializing data members

dbcreator=new DBCreator(context)

getting writable datbase from class DBCreator this method is inherited in

DBCreator from its parent

db=dbcreatorgetWritableDatabase()

method to insert a record

public int InsertRecord(student s)

try

sql query to insert a record

String sql=inser+DBCreatorstudent_TABLE_NAME+(studentNameMarks)

values(+sgetName()++sgetMarks()+ )

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

public String getName() return Name public void setName(String name) Name = name public int getMarks() return marks public void setMarks(int marks) thismarks = marks

Explanation student class is self explanatory it has member variables getters setters

construtors

DAO CLASS

package commujadid001

import androidcontentContentValues

import androidcontentContext

import androiddatabaseCursor

import androiddatabasesqliteSQLiteDatabase

import androidutilLog

DAO class

public class DAO

an object of class SQLiteDatabase which have built in functions to manipulate database

SQLiteDatabase db

creating a reference of class DBCreator

DBCreator dbcreator

creating an object of type Context

Context context

constructor

public DAO(Context context)

initializing data members

dbcreator=new DBCreator(context)

getting writable datbase from class DBCreator this method is inherited in

DBCreator from its parent

db=dbcreatorgetWritableDatabase()

method to insert a record

public int InsertRecord(student s)

try

sql query to insert a record

String sql=inser+DBCreatorstudent_TABLE_NAME+(studentNameMarks)

values(+sgetName()++sgetMarks()+ )

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

creating a reference of class DBCreator

DBCreator dbcreator

creating an object of type Context

Context context

constructor

public DAO(Context context)

initializing data members

dbcreator=new DBCreator(context)

getting writable datbase from class DBCreator this method is inherited in

DBCreator from its parent

db=dbcreatorgetWritableDatabase()

method to insert a record

public int InsertRecord(student s)

try

sql query to insert a record

String sql=inser+DBCreatorstudent_TABLE_NAME+(studentNameMarks)

values(+sgetName()++sgetMarks()+ )

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

executing sql query

dbexecSQL(sql)

return 1

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOInsert)

return -1

method to delete a record

public int DeleteRecord(int id)

try

using built in delete function of class SQLitDatabase

return dbdelete(DBCreatorstudent_TABLE_NAME studentId= new

String[]+id)

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

logging if any exception occurs

Loge(DB etoString()+ DAOdelete)

return -1

public int UpdateRecord(student s)

try

creating an object of type ContentValues (explained already in tutorial)

ContentValues values=new ContentValues()

storing kay value pairs in it

valuesput(studentName sgetName())

valuesput(marks sgetMarks())

calling built in update function of class SQLitDatabase

return dbupdate(DBCreatorstudent_TABLE_NAME values studentId=

new String[] StringvalueOf(sgetId()))

catch(Exception e)

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

logging if any exception occurs

Loge(DB etoString()+ DAOUpdateRecord)

return -1

getting all records

public Cursor GetRecords()

now I have used rawQuery function of class SQLitDatabase

Cursor c=dbrawQuery(select from +DBCreatorstudent_TABLE_NAMEnull)

returning an object of class Cursor(explained already in tutorial)

return c

closing databse

public void close()

dbclose()

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

activity_mainxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=MainActivity gt lt-- creating a button --gt ltButton androidid=+idadd androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginTop=43dp androidlayout_weight=1 androidtext=stringAdd androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idremove androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idadd androidlayout_alignBottom=+idadd androidlayout_alignParentRight=true androidlayout_marginRight=25dp androidtext=stringremove androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idselect androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idadd androidlayout_marginTop=50dp androidtext=stringselect androidonClick=onClick gt lt-- creating a button --gt ltButton androidid=+idupdate androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignBaseline=+idselect

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

androidlayout_alignBottom=+idselect androidlayout_alignRight=+idremove androidtext=stringupdate androidonClick=onClick gt

ltRelativeLayoutgt

MainActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidcontentIntent

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

public class MainActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_main)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_main menu)

return true

onclick method to handle click event of buttons

Override

public void onClick(View view)

switch(viewgetId())

case Ridadd

creating an intent to goto activity to add a new record

Intent it=new Intent(MainActivitythisAddActivityclass)

starting new activity

startActivity(it)

break

case Ridremove

creating an intent to goto activity to select all records

it=new Intent(MainActivitythisDeleteActivityclass)

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

starting new activity

startActivity(it)

break

case Ridselect

creating an intent to goto activity to delete a record

it=new Intent(MainActivitythisSelectActivityclass)

starting new activity

startActivity(it)

break

case Ridupdate

creating an intent to goto activity to update a record

it=new Intent(MainActivitythisUpdateActivityclass)

starting new activity

startActivity(it)

break

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

ExplanationMainActivity is very simple it has only one clickListener method onClick to handle click

events an intent to desired activity is created and activity is started

Activity_addxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=AddActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringsname gt ltEditText androidid=+ideditText1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentRight=true androidlayout_below=+idtextView1 androidems=10 androidinputType=textPersonName gt ltrequestFocus gt ltEditTextgt ltTextView androidid=+idtextView2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ideditText1 androidtext=stringmarks gt ltEditText androidid=+ideditText2 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignRight=+idtextView1 androidlayout_below=+idtextView2 androidems=10 androidinputType=numberDecimalgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

androidlayout_height=wrap_content androidlayout_alignBaseline=+ideditText2 androidlayout_alignBottom=+ideditText2 androidlayout_marginLeft=35dp androidlayout_toRightOf=+idtextView2 androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

AddActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class AddActivity extends Activity implements OnClickListener

data members

String name

int marks

student s

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_add)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_add menu)

return true

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

overriden onClick method called when button is clicked

Override

public void onClick(View v)

getting value of editText Field

String temp=((EditText)findViewById(RideditText2))getText()toString()

parsing it into integers

marks=IntegerparseInt(temp)

getting value of editText Field

name=((EditText)findViewById(RideditText1))getText()toString()

creating an DTO object of type student

s=new student(namemarks)

creating an object of DAO class

DAO dao=new DAO(AddActivitythis)

calling its method insert

int i=daoInsertRecord(s)

checking if return value is +ve then its mean a record is inserted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() 1 record has been

added ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() record has not been

added ToastLENGTH_LONG)show()

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

finishing this activity

finish()

Explanation in activity_addxml we have two edittext and a button when a button is clicked

we get value of edit text field and make an object of class students and call method of DAO

class insertRecord() when a record is inserted a message is displayed and activity is

finished

DELETE A RECORD

activity_ deletexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=DeleteActivity gt ltEditText androidid=+ididfield androidlayout_width=50dp androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidems=10 androidhint=id androidinputType=number gt ltrequestFocus gt ltEditTextgt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_centerHorizontal=true androidonClick=onClick androidtext=stringsubmit gt

ltRelativeLayoutgt

DeleteActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class DeleteActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_delete)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_delete menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield))getText()toString()

parsing it into integers

int deleteID=IntegerparseInt(id)

creating an anonymous object of DAO class and calling deleteRecord

method

int i=new DAO(DeleteActivitythis)DeleteRecord(deleteID)

checking if return value is +ve then its mean record has deleted else an

error has occured

if(igt0)

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

ToastmakeText(getApplicationContext() i+ record has been

deleted ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in delete_activityxml we have one edittext and a button when a button is clicked we

get value of edit text field and call method of DAO class DeleteRecord() when a record is deleted a

message is displayed and activity is finished

UPDATE A RECORD

activity_ updatexml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=UpdateActivity gt ltTextView androidid=+idtextView1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_alignParentTop=true androidtext=stringprompt gt ltEditText androidid=+idmarksPrompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+idnameprompt androidlayout_marginTop=19dp androidems=10 androidhint=enter marks androidinputType=phone gt ltrequestFocus gt ltEditTextgt ltEditText

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

androidid=+ididfield2 androidlayout_width=60dp androidlayout_height=wrap_content androidlayout_alignParentTop=true androidlayout_marginLeft=14dp androidlayout_toRightOf=+idnameprompt androidems=10 androidhint=id androidinputType=phone gt ltButton androidid=+idbutton1 androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_below=+idmarksPrompt androidlayout_marginTop=56dp androidlayout_toRightOf=+idtextView1 androidonClick=onClick androidtext=stringsubmit gt ltEditText androidid=+idnameprompt androidlayout_width=wrap_content androidlayout_height=wrap_content androidlayout_alignParentLeft=true androidlayout_below=+ididfield2 androidems=10 androidhint=Enter new name androidinputType=textPersonName gt

ltRelativeLayoutgt

UpdateActivityjava

package commujadid001

import androidosBundle

import androidappActivity

import androidviewMenu

import androidviewView

import androidviewViewOnClickListener

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

import androidwidgetEditText

import androidwidgetToast

public class UpdateActivity extends Activity implements OnClickListener

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_update)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_update menu)

return true

Override

public void onClick(View v)

getting value of editText Field

String id=((EditText)findViewById(Rididfield2))getText()toString()

parsing it into integers

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

int ID=IntegerparseInt(id)

String mark=((EditText)findViewById(RidmarksPrompt))getText()toString()

parsing it into integers

int marks=IntegerparseInt(mark)

getting value of editText Field

String name=((EditText)findViewById(Ridnameprompt))getText()toString()

creating an DTO object of type student

student s=new student(IDnamemarks)

creating an object of DAO class

DAO dao=new DAO(UpdateActivitythis)

calling its method updateRecord

int i=daoUpdateRecord(s)

checking if return value is +ve then its mean a record is updated else an error has occured

if(igt0)

displaying message

ToastmakeText(getApplicationContext() 1 record has been updated

ToastLENGTH_LONG)show()

else

ToastmakeText(getApplicationContext() no record has added

ToastLENGTH_LONG)show()

finish()

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

Explanation in update_activityxml we have three edittext fields and a button when a button is

clicked we get value of all edit text fields make an object of class student and call method of DAO

class UpdateRecord() when a record is updated a message is displayed and activity is finished

Displaying all records

activity_selectxml

ltRelativeLayout xmlnsandroid=httpschemasandroidcomapkresandroid xmlnstools=httpschemasandroidcomtools androidlayout_width=match_parent androidlayout_height=match_parent toolscontext=SelectActivity gt ltListView androidid=+idlist1 androidlayout_height=fill_parent androidlayout_width=fill_parent gtltListViewgt

ltRelativeLayoutgt

SelectActivityjava

package commujadid001

import javautilArrayList

import androidosBundle

import androidappActivity

import androiddatabaseCursor

import androidviewMenu

import androidwidgetArrayAdapter

import androidwidgetListView

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

import androidwidgetToast

public class SelectActivity extends Activity

Override

protected void onCreate(Bundle savedInstanceState)

superonCreate(savedInstanceState)

setContentView(Rlayoutactivity_select)

getting reference to listview

ListView lv=(ListView) findViewById(Ridlist1)

creating an object of type ArrayList

ArrayListltStringgt al=new ArrayListltStringgt()

creating an anonymous object of DAO class and calling getRecords method and

storing in Cursor object

Cursor c=new DAO(this)GetRecords()

Adding all records in cursor into arraylist object

while(cmoveToNext())

getting integer value of first column

int id=cgetInt(0)

getting string value of 2nd column

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

String name=cgetString(1)

getting integer value of 3rd column

int marks=cgetInt(2)

adding them in to array list

aladd(+id+ +name+ +marks)

creating an array adapter

ArrayAdapterltStringgt adapter=new

ArrayAdapter(thisandroidRlayoutsimple_list_item_1al)

setting adapter to list

lvsetAdapter(adapter)

Override

public boolean onCreateOptionsMenu(Menu menu)

Inflate the menu this adds items to the action bar if it is present

getMenuInflater()inflate(Rmenuactivity_select menu)

return true

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut

Explanation In select_actictyxml we have only a listView in java class we get reference to this

listview

After that we make an object of arraylist of type string we create an object of DAO class and called

method getRecords() which returns a cursor object we received cursor object an iterate over it to

get all records and save them in arrayList then we made an object of type arrayAdapter and then

set it to list

Sample OutPut