Android

Agenda:-

1. What is Android?

2. Introducing to Open Handset Alliance.

3. Understanding android Framework.

4. What is Dalvik Virtual Machine?

5. Different version of android OS.

6. Prominent instruments of android environment.

7. Android environment programming.

8. How android manages memory.

9. Application Development Tool.

What Is Android ?

A software platform and operating system for mobile

devices

Applications in Android..

1. Whats App..

2. Facebook..

3. We-Chat..

4. Mx-Player..

5. Line ..

6. Times-Of-India..

U can also create ur customized App

What is OHA ?A BUSINESS ALLIANCE

CONSISTING OF 47 COMPANIES TO DEVELOP OPEN STANDARDS FOR

MOBILE DEVICES

Framework..

Android 2.2 Foroyo

Android 1.6 Donut

Android 2.1 Eclairs

Android 1.5Cup cake

Android 2.3 Gingerbread

Android 2.3Ice-CreameSandwich

Setting up Android Application Development

INSTALL ECLIPSE INSTALL ANDROID

SDK (ANDROID LIBRARIES)

INSTALL ADT PLUGIN (ANDROID DEVELOPMENT TOOLS)

Programming

Android Applications are written in Java

package com.google.android.helloactivity;

import android.app.Activity;import android.os.Bundle;

public class HelloActivity extends Activity {public void onCreate(Bundle savedinstantstate) { super.onCreate(savedinstantstate); setContentView(R.layout.hello_activity);}}

Memory Management Function..

Before execution, Android applications are converted into the compact Dalvik Executable (.dex) format, which is designed to be suitable for systems that are constrained in terms of memory and processor speed.

.java

.class

.dex

Dalvik Virtual Machine

Application Development Tools

• Activity

• IntentReceiver

• Service

• ContentProvider

Activity..

Represents the presentation layer of an Android application, e.g. a screen which the user sees.

Intent..

These are message passing mechanism

Activity 1

Activity 2

Services…

• Faceless components that run in the background– E.g. music player, network

download etc…

Content Provider…

• Enables sharing of data across applications– E.g. address book, photo gallery

Working with Eclipse..

Project Explorer window

Name that appearson device

Directoryname

Class toautomatically

create

Java package

Androidversion

Auto-generatedcode

UIlayout

Stringconstants

Configuration

“Hello, Android” Application’s

HelloWorld.java

1 public class HelloAndroid extends Activity {

2  /** Called when the activity is first created. */

3    @Override

4    public void onCreate(Bundle savedInstanceState)

5 {

6      super.onCreate(savedInstanceState);

7        setContentView(R.layout.main);

8    }

9 }

Main.xml

<?xml version="1.0" encoding="utf-8"?>

2 <LinearLayout

3 xmlns:android="http://schemas.android.com/apk/res/android"

4 android:orientation="vertical"

5 android:layout_width="fill_parent"

6 android:layout_height="fill_parent"

7 >

8 <TextView

9 android:layout_width="fill_parent"

10 android:layout_height="wrap_content"

11 android:text="@string/hello "

12 />

13 </LinearLayout>

Strings.xml

<?xml version="1.0" encoding="utf-8"?>

2 <resources>

3 <string name="hello">Hello World, Hello Android!

4 </string>

5 <string name="app_name">Hello, Android</string>

6 </resources>

AndroidManifest.xml

Final Developed Application:-

Thank You…