The introduction about the Android

1. Android
By
Durai. S
duraisy2k@gmail.com

2. Android
Android is a software platform for mobile devices
based on the Linux Operating system an which is
developed by Google and Open Handset Alliance.
Android is a software stack for mobile devices that
includes an operating system and applications.

3. Open handset alliance

4. History of android
It was Founded in Palo Alto, California , United States
in October 2003 by Andy Rubin , Rich Miner, Nick
Sears and Chris White.
Google Inc. purchased the initial developer of the
software , Android Inc in 2005.

5. Versions of android
Android 1.0
Android 1.1
Android 1.5 Cupcake.
Android 1.5 Donut.
Android 2.0/2.1 Éclair.
Android 2.2.x Froyo
Android 2.3.x Gingerbread
Android 3.x Honeycomb
Android 4.0.x Ice Cream Sandwich
Android 4.1.x Jelly Bean

6. Android Vs other mobile os

7. Comparison with ios

8. Comparison with symbian
ANDROID SYMBIAN
Easy to upgrade Upgrade is not available
Processor is high Processor speed is low
Lot of free apps in Google Less no of free apps in OVI
play store
Smooth handling Rough handling
User friendly Not User Friendly

9. Comparison with windows
ANDROID WINDOWS MOBILE
Android is Open source Windows mobile is similar to
Platform windows and has lot of legal
bindings
Google Play has more than Compare with android it has
500,000 apps only less no of apps and also
no free apps
With Google it is more No such features are here
powerful with Google Maps
and Google voice search
Google Wallet app No such type of app is there
Full , Multiple Account Sync Gmail support only through
,no outlook required outlook express.

10. Building and Running
● Android asset packaging tool (aapt) crawls through the resource
folder and generates an integer ID for every resource. These ID’s
are written into R.java source file under generated sources folder
where they can be accessed from application code.
● Java compiler (javac) compiles the application’s java source files
along with generated source files
● Dexer (dx) translates the compiled Java bytecode into Dalvik
bytecode (dex) format
● Apkbuilder zips the resource table, application code and
compiled resource into an apk file

11. Building and Running
● Android programs are compiled into .dex (Dalvik Executable)
files, which are in turn zipped into a single .apk file on the
device. .dex files can be created by automatically translating
compiled applications written in the Java programming
language.

12. DVM vs JVM

13. Building Blocks of Android
● An Activity
● An Intent
● A Service
● A Content provider
● A Broadcast Receiver

14. An Activity
● The activity is the most visible form of an Android
application. An activity presents the UI to an
application, along with the assistance of a class
known as a view
● An application may contain one or more activities.
They are typically on a one-to-one relationship with
the screens found in an application.

15. An intent
● An application moves from one activity to another
by calling a method known as Intent.

16. A Service
● applications running "in the background"
● The service is an Android application that has no UI

17. A Content Provider

18. A Broadcast receiver
● A Component that does nothing but receive and
react to broadcast announcements.
● Doesn't has the UI.
● They may start an Activity in response to the
information theu receive.

19. Life-Cycle of Activity

20. Life-Cycle of Activity
● onCreate():
Called when the activity is first created
An activity does all its initial setup of global state
Always followed by onStart()

21. Life-Cycle of Activity
● onRestart()
called after the activity has been stopped.
Always followed by onStart()

22. Life-Cycle of Activity
● onStart():
Called just before the activities become visible
to the user
Followed by onResume() if the activity comes
to the foreground

23. Life-Cycle of Activity
● onResume()
Called just before the activity starts
interacting with the user
always followed by onPause()

24. Life-Cycle of Activity
● onPause():
Called when the system is about to start
resuming another activity
The next Activity will not resumed until it
returns.
Followed either by onResume() if the activity
returns back to the front, or by onStop if it comes
invisible to user.

25. Life-Cycle of Activity
● onStop:
Called when the Activity is no longer visible to
user.
Because it is being destroyed or another activity
has been resumed.
Followed either by onRestart() if the activity is
coming back to interact with the user, or by
onDestroy() if this activity is going away.

26. Life-Cycle of Activity
● onDestroy():
Called before the activity is destroyed
Final call that the activity will receive