Android is an open-source, Linux-based operating system for mobile devices like smartphones and tablets. It is developed by the Open Handset Alliance led by Google. The architecture of Android includes a Linux kernel, libraries and APIs written in C/C++, a Java-compatible runtime, and various core applications and components. Some key components are activities for screens, services for background tasks, content providers for sharing data across apps, and broadcast receivers for responding to system events. Developers can create Android apps using the Android SDK and build tools.

1. INTRODUCTION
TO
ANDROID
By - Ilyas Ahamed

2. What is Android ?

3. Android is a Linux-based operating system for
mobile devices such as smartphones and
tablets.
It is developed by the Open Handset Alliance,
led by Google.

4. More about Android…
• Android, Inc. was founded in Palo Alto,
California, United States in October 2003
by Andy Rubin.
• Over 600,000 and more applications
available in Android Market.
• Open software platform for mobile
development.

5. Why choose Android ?

6. Android Versions
Cupcake - 1.5
Eclair - 2.0, 2.1
Froyo - 2.2
Gingerbread - 2.3.0
Honeycomb - 3.0
IceCream Sandwitch - 4.0
Jelly Beans - 4.1

7. Architecture

9. Linux Kernel
•
•
•
•
Device drivers
Memory management
Process management
Networking

10. Libraries
•
•
•
•
•
C/C++ libraries
Interface through Java
Surface manager – Handling UI Windows
2D and 3D graphics
Media codecs, SQLite, Browser engine

11. Android Runtime
•Dalvik VM
– Compact and efficient than class files
– Limited memory and battery power
•Core Libraries
– Java 5 Std edition
– Collections, I/O etc…

12. Application Framework
• API interface
• Activity manager – manages application
life cycle.

13. Applications
• Built in and user apps
• Can create your own apps

14. Application Components
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•
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Activities
Services
Content Providers
Broadcast receivers

15. Activities
An activity represents a single screen with a
user interface.
For example, an contacts application.

17. Services
A service is a component that runs in the
background to perform long-running
operations.
– E.g. music player, network download etc…

18. Content Providers
• Enables sharing of data across
applications
– E.g. address book, photo gallery
• Provides uniform APIs for:
– querying
– delete, update and insert.
• Content is represented by URI and MIME
type

19. Broadcast Receivers
• Components that respond to broadcast
‘Intents’
• Way to respond to external notification or
alarms
• Apps can invent and broadcast their own
Intent
intent is an abstract description of an operation to
be performed

21. Development Tools
• Eclipse
• Android SDK
developer.android.com

22. References
http://developer.android.com
http://sites.google.com/site/io