DEVELOPING ANDROID APPLICATION BY

PANKAJ SARANGI11MTESD01

GUIDE-MAHENDRA K.R. CHOUDHURY

SUIITEMBEDDED SYSTEM DESIGN

POINTS OF DISCUSSION

About AndroidDevelopment EnvironmentConcepts for android developmentDesign of the projectConclusionFuture scopeReferences

ABOUT ANDROID

• The aim of this project is to design an application named as “Traveler Assistant” which helps user to keep a track of the expenses made during their travel and do a little other stuff.

• Before going to develop the actual development we should know what are the prerequsite for developing the application

Windows Mobile

Symbian Blackberry Iphone Android

Promoted by Microsoft Nokia RIM Apple Google and OHA

Platform proprietary Now open source

proprietary proprietary Open Source

Development Require Windows

Any platform Any platform Mac Open Source

Development Tools

C++, .net,J2ME,HTML,CSS

C,c++,J2ME, HTML,css,javaScript,J2ME

Objective c Java,xml

Leading Companies

Acer, HTC, Samsung, HP

Nokia, SamsungSony

RIM apple Samsung,HTC,

DIFFERENT OPERATING SYSTEM

Andy RubbinCo-founder of Android INCSVP, Mobile and Digital ContentGoogle INC1. Android is a open software platform for mobile

application development.2. Android is a complete stack which includes operating

system, middleware and application. The operating system is powered by Linux and the application development is done using java

ECOSYSTEM OF ANDROID

ANDROID VERSIONS

BASIC QUESTIONS ON ANDROID1. What are various building blocks of android app?2. What is the life cycle of android app?3. How does a app handles hardware events?4. How does an app runs background jobs?5. How to access the database?

BUILDING BLOCKS OF ANDROID

WHAT IS ACTIVITY

WHAT IS INTENT

A description on what is to be done

WHAT IS SERVICE

Back ground job that has no pause or stopped stage

CONTENT PROVIDER

A barrier between the application and the database so that the data base is not in inconsistent state

WHAT IS BROADCAST RECEIVER

Alert messages like battery low etc

WHY ANDROID IS BETTER ?

  

• Applications   - google applications   -widgets  -Android Market  • Multitasking

• SDK • Modifiability: 

  

D

EVELOPMENT

ENVIRONMENT

Software necessary for Android development are

• Java runtime environment(JRE)

• Eclipse IDE

• Android Software Development Kit(SDK)

• Android development plug-in tools(ADT)

• Android Virtual Device(AVD) or Emulator

ECLIPSE

C

DDMS

ANDROID EMULATOR

CONCEPT FOR

ANDROID

DEVELOPMENT

FILES THAT MAKES AN ANDROID APP

•Src•Gen•Res drawable layout values string menifest

LAYOUT

MENIFEST FILE

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android=http://schemas.android.com/apk/res/android //start package="com.pankaj.pankajdrawables“ //package //android name space decoration android:versionCode="1“ //used by the store android:versionName="1.0" >

<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name“ //nmame android:theme="@style/AppTheme" > <activity //activity android:name="com.pankaj.pankajdrawables.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application>

</manifest> //end

VALUES

DRAWABLES

SUPPORTING DIFFERENT SCREEN

LAYOUTS

LINEAR LAYOUT (VERTICAL)

LINEAR LAYOUT (HORIZONTAL)

RELATIVE LAYOUT

INTENT

NOTIFICATION

MEDIA PLAYER

VIDEO PLAYER

BEHIND THE SCREEN

DESIGN OF

PROJECT

The blue print of my project is given below

Expense activity

Traveler Assistant main

screen

Expense item activity

Alert dialogue

video

Notification

Audio

Face book and dial

Broadcast receiver

JAVA FILES

•MainActivity.java, •ExpenseActivity.java, •ExpenseItemActivity.java,•ExpenseBR.java, •TimeZoneChangeBR.java, •IntentActivity.java•Media.java, •Video.java,•Notifications.java, •NotificationClickedActivity.java

XML FILES

•activity_main.xml•expenselayout.xml•addexpenselayout.xml•intent_activity.xml•audioplayer.xml•video.xml•activity_notifications.xml•after_notification_is_clicked.xml•strings.xml•AndroidManifest.xml

DESIGNING THE MAIN SCREEN• A xml layout file activity_main.xml was created where there are two buttons named as login button and cancel button, two text views named as user id and password and two edit text where we can write into.• Then a class is to be declared as MainActivity.java with an interface onClick where we can write the code. •The xml file is linked to the code by R.layout.xml • The reference to the objects on the UI are created by findViewById.•Then we have to set the listener by the method setOnClickListener•After this we have to implement the interface .inside interface implementation we have to display some message by the method Toast.makeText•After running this application in eclipse we can see some text are displayed when the button is clicked

ADDING MENU ITEMS TO THE MAIN SCREEN

•To the MainActivity.java we have to add some code so that on clicking on the menu button of the phone we will be able to see the menu.•I have added six menu items to the screen they are Expense,audio,video,Notification,preferences,facebook•Though we can create menu using xml I have created it using API so there is no need for xml layout file•So adding a method onCreateOptionsMenu I have created the menu items•Then by another method onOptionsItemSelected we can do what we want to do with the menu

DEVELOPING THE EXPENSE MENU•First we have to modify the MainActivity.java so that we will be able to redirected to a new screen when expense menu is clicked. this is done by creating an intent object. Then by intent creation we can be able to move to a new activity. Thanks to myIntent= new Intent(getBaseContext(),ExpenseActivity.class);startActivity(myIntent);In ExpenseActivity we have to add an xml file expenselayout.xml and link it to the class.From this class we have to start a new class so we have to add an intent. Now on clicking addexpense button we will be taken to another screen so we have to create another class ExpenseItemActivity.java

•In ExpenseItemActivity we have to link an xml file addexpenselayout.xml and giving reference to object and setting the listener .•Then implementing the interface we can be able to do what we want to do with the buttons.•Now we have to add some alert message on clicking of the buttonBy the method protected Dialog onCreateDialog(int id). Inside this we have to set the icon ,title .•Finally we have to add these newly created activity in the menifest file.•On running the application on the emulator we will see the following output

DESIGNING THE FACE BOOK MENU•Now when the user clicks on face book menu he ll be taken to the new screen where he can dial an emergency number or browse face book•We have to first modify the MainActivity.java so that we can go to a new screen•Then we have to create a new layout file such that it will display two buttons to the user one for face book and other for dial named as intent_activity.xml.•Again we have to create a new class IntentActivity.java where the above xml file is linked. and the reference to the object are set ,onclick listener is set•Then we have to implement the interface in such a way that we can go to another page on clicking the button. this is done by again using an intent.•We have to include the newly created class to the menifest file.

•For the icon we have to copy an image in png format and paste it inside the draw-able folder•Then we have to modify the String.xml to some extent.•The output is shown below

•

•

ADDING BROADCAST•Then we are going for adding some broadcast receiver which we can see in Logcat of DDms•For this we have to declare the two classes for two broadcast receiverExpenseBR.java and TimeZoneChangeBR.java.•we have to include these two classes to menifest file•Here only difference with the class is that its super class is Broadcast receiver.•Inside the classes by the method public void onReceive(Context context, Intent intent) and a Log.v we will be able to see the broadcast in the logcat process

ADDING THE MEDIA PLAYER•On click of the media the UI will be shown and on click of play the music will start playing•For this we have to modify the case statement of main activity as to move to a new UI•we have to add music file which are in .mp3 format and the name is in lowercase in the newly created ‘raw’ file.•We have to add a xml file which will show the user the option to start and stop the music•After this we have to create a new class media.java .•Inside the class we have to declare MediaPlayer mp, give the references to the button play and stop,setting the listner method.•By the methods mp.prepare(),mp.start(),mp.stop() we can able to listen the music

ADDING THE VIDEO PLAYER

•Here we are going to add some more entertainment for the user by adding some videos. On clicking on the video menu he ll be taken to another activity where he can see a video•For this we have to add a .mp4 file to the “raw” folder and then we are going to add an xml for video view the layout is quiet different.•Then we are going to add a Video class where the above xml file will be linked•We will add the video by defining a Uri and parsing it to Uri.parse("android.resource://"+getPackageName().toString()+"/"+R.raw.raju);

•By the below methods we can be able to see the videos vv.setVideoURI(uripath); vv.setMediaController(new MediaController(this)); vv.requestFocus(); vv.start();

WARNING MENUAfter this we will try to add some warning when the user will click on warning menu he will be taken to a page where when he clicks on the button some notification will be shown on top of the phone on clicking the notification he ll be shown a warning messageFor this we have to change the main activity as to go to the warning screenthen by adding the xml file activity_notification.xml where the user clicks the buttonafter this we have to link this xml file to the newly created class Notifications.javaThen we have to create a a new class NotificationClickedActivity and here we will link the xml file after_notification_is_clicked.xml We will add these activities to the menifest and run the program we ll be able to see the warning message

CONCLUSION

FUTURE

SCOPE

•A database can be embedded into the application•Some google services like google map can be added•We can publish our app in google play store

THANK YOU

Pankaj.sarangi@suiit.ac.inmkr.choudhury@gmail.com