The document provides an introduction to the Android environment including: - What Android is and the companies involved in its development like Google and the Open Handset Alliance. - An overview of the Android software stack including the Linux kernel, libraries, application framework and Dalvik virtual machine. - Different versions of the Android OS from 1.5 to 2.4 and their major features. - How the Android environment is growing with over 350,000 new Android devices being activated daily.

1. Introduction to Android Environment By Ankita Gahoi

4. What is the Open Handset Alliance (OHA)? -> It's a collaboration of several companies.Its a group of 79 hardware,software and telecom companies devoted to advancing open standards for mobile devices.

5. Android software stack

17. 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 HelloActivity() { } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.hello_activity); }

18. Android applications are compiled to Dalvik bytecode Transformed to Dalvik bytecode Compiled in Java Write app in Java Linux OS Loaded into Dalvik VM

19. Android emulators

21. Compare-what all app have been developed. In Compare,We have 8 android applications in different fields live in android Market -

33. Devices Running Android OS Olive Pad A tablet computer by Olive 7” Capacitive Touch screen Running on Android 2.2(Froyo)‏

34. Devices Running Android OS

35. Devices Running Android OS Even Washing machine and oven runs on Android !

36. Distribution in different versions Android 1.5 - 2.3% Android 1.6 - 3.0% Android 2.1 - 24.5% Android 2.2 - 65.9% Android 2.3 - 1.0% Android 2.3.3 - 3.0% Android 3.0 - 0.3%