This document provides an overview of the Android operating system, including its history, architecture, apps, and development challenges. It discusses that Android was founded in 2003 by Andy Rubin, Rich Miner, Nick Sears and Chris White. In 2007, the Open Handset Alliance was formed between Google, device manufacturers, wireless carriers and chipset makers to develop Android. It then covers the main Android versions from 2008 to present, the architecture including activities and intents, and challenges such as fragmentation and screen sizes.

1. Android Course ….

2.  Brief history about android.
 Features of android.
 Development challenges in android.
 Android OS architecture.
 Apps of android.
 Apps Architecture.
 Manifest file.
 Activity life cycle.
 Intent class.
Session Content

3.  Foundation company.
 Founders of Android OS.
 Open Handset Alliance.
 Why android is number one in the world.
 Versions of android OS till now.
Android’s brief history …

4.  Foundation company of Android OS:-
Android was founded in Palo Alto company in
October 2003 in California.
The main target was to invent an OS for
digital cameras but they were changed their
efforts to produce mobile OS.
In august Google was buying android.
Android’s brief history cont’d

5.  Android founders:-
 Andy Rubin (brain and manager of producing
android OS in google later).
 Rich Miner.
 Nick Sears.
 Chris White.
Android’s brief history cont’d

6. On November 5, 2007, the Open Handset Alliance,
a consortium of technology companies including
 Google
 Device manufactures
Sony – Samsung – HTC
 Wireless Carriers
sprint Nextel – T-Mobile
 Chipset makers
Qualcom – Texas Instrument
Open Handset Alliance

7.  Why android is number one in the world…?
In 2011,2013 Android devices sell more than
IOS, Windows Phone and Mac OS.
On July 2013 Google play stores had over 1
million android Apps published and over 5 billion
App downloaded.
In April-May 2013 71% of mobile developers developed
in android.
Android’s brief history cont’d

8. Versions of android:-
Android alpha (1.0) Gingerbread (2.3–2.3.7)
Android beta (1.1) Honeycomb (3.0–3.2.6)
Cupcake (1.5) Ice Cream Sandwich (4.0–4.0.4)
Doughnut (1.6) Jelly Bean (4.1–4.3.1)
Eclair (2.0–2.1) KitKat (4.4–4.4.4)
Froyo (2.2–2.2.3)
Android’s brief history cont’d

9.  Open platform
open source
open plug in
 Java Implementation(not native).
 fragmentation
Features of Android

10.  Fragmentation Issue.
 Resolution Issue.
 Screen sizes Issue.
 Portability Issue.
Development challenges in
android

11. Android OS Architecture

12.  Every App consists from a set of Activities.
 Activity
single screen in your program that will do a
specific task.
Apps of Android

13. Apps Architecture
Hello
World!
Button
App Layout

14.  The manifest file is a mandatory file for every
application
 Contains:
 Application declaration
 Activities
 Services
 Permissions
 Hw and Sw resources used by the Application
 Intent-filters
Manifest File

15. Activity life cycle

16.  onCreate() Called when the activity is first created, a must!
 onStart() Called when the activity becomes visible to the user
 onResume() Called when the activity starts interacting with the
user
 onPause() Called when the current activity is being paused and the
previous activity is being resumed
 onStop() Called when the activity is no longer visible to the user
 onDestroy() Called before the activity is destroyed by the system
(either manually or by the system to conserve memory)
 onRestart() Called when the activity has been stopped and is
restarting again
Activity life cycle cont’d

17.  Intents: asynchronous messages to activate
core Android components (e.g. Activities).
 Explicit Intent  The component (e.g. Activity1)
specifies the destination of the intent (e.g. Activity
2).
Intent class
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