The document provides an overview of the history and development of the Android operating system. It discusses how Android was founded in 2003 and later developed by Google. It describes the various versions of Android from 1.0 to the upcoming versions. It also outlines the key aspects of the Android architecture including its open source nature, use of Java and Linux kernel, and its layered design. Finally, it covers the features, advantages, disadvantages and security aspects of the Android platform.

2. Contents
History
Introduction of android
Android versions
Android architecture
Security
Features of android
Advantages of android
Disadvantage of android
Conclusion

3. HISTORY OF ANDROID
Android Inc.founded in Palo Alto,california ,united
states in October 2003 by Andy Rubin[co-founder of
danger ],rich miner[co-founder of wildfire
communication Inc.],nick sears[once VP at T-mobile],
and Chris white[headed design and interface
development at web TV] to develop.

4. WHAT IS ANDROID?
• It is a open source software platform and operating system
for mobile devices
• Based on the Linux kernel
• Developed by Google and later the Open Handset Alliance
(OHA)
 Allows writing managed code in the Java language
• Android has its own virtual machine i.e. DVM(Dalvik Virtual
Machine),which is used for executing the android applicatn.
• Google purchased the initial developer of the software ,
android incorporated in 2005.

5. Open Handset Alliance
• The open handset alliance(OHA) is a
business alliance of firm to develop
open standard for mobile devices.
• Devoted to advancing open standards
for mobile devices
• Develop technologies that will
significantly lower the cost of developing
and distributing mobile devices and
services.

6.  Open Handset Alliance (OHA) included
several companies

8. ANDROID VERSION
Android 1.0 (Angel Cake)
The first version of the open source software was released back in 2008
Android 1.1 (Battenberg)
In Feb 2009, version 1.1
Android 1.5 (Cupcake)
Launched in April 2009
Android 1.6 (Donut)-released in sept 2009
Android 2.0 2.1 (Éclair)-released in 26 October 2009
Android 2.2 (Froyo)
released in the summer of 2010
Android 2.3 (Gingerbread)
Gingerbread landed by the end of 2010
Android 3.0 (Honeycomb)
For the first time Google released a software that was totally
focused on tablets. This version, released in 2011
Android 4.0 (Ice Cream Sandwich 4.0) released in 2012
Android 4.1 (jelly bean4.1) released in 2013

9. Upcoming Android Version
ANDROID 5.0 KEY
LIME PIE
ANDROID 4.4 KITKAT
Will be Released october
2013

10. ANDROID ARCHITECTURE
The software stack is split into Four Layers::
• The application layer
• The application framework
• The libraries and runtime
• The kernel

12. LINUX KERNEL
•The architecture is based on the Linux2.6 kernel.
• This layer is core of android architecture. It provides
service like power management, memory management,
security etc.
• It helps in software or hardware binding for better
communication.

13. NATIVE LIBRARIES
• Android has its own libraries, which is written in C/C+
+. These libraries cannot be accessed directly. With
the help of application framework, we can access
these libraries. There are many libraries like web
libraries to access web browsers, libraries for android
and video formats etc.

14. Android Run Time
• The Android Runtime was designed specifically for
Android to meet the needs of running in an embedded
environment where you have limited battery, limited
memory, limited CPU.
• Dalvik is the process virtual machine in Google's
android operating system. It is the software that runs the
apps on android devices. Dalvik is thus an integral part
of android ,which is typically used on mobile devices
such as mobile phones and tablet computers.
• Programs are commonly written in java and compiled to
byte code.

15. Android Run Time
•This is in blue, meaning that it's written in
the Java programming language.
•The core library contains all of the collection
classes, utilities, IO, all the utilities and tools
that you’ve come to expected to use.

16. Application Framework
•This is all written in a Java programming language and
the application framework is the toolkit that all
applications use.
•These applications include the ones that come with a
phone like the home applications, or the phone
application.
•It includes applications written by Google, and it
includes apps that will be written by you.
•So, all apps use the same framework and the same
APIs.

17. Contd…
These are as follows:-
• Activity manager:-It manages the lifecycle of applications. It
enable proper management of all the activities. All the activities are
controlled by activity manager.
• Resource manager:-It provides access to non-code resources such
as graphics etc.
• Notification manager:-It enables all applications to display
custom alerts in status bar.
• Location manager:- It fires alerts when user enters or leaves a
specified geographical location.
• Package manager:-It is use to retrieve the data about installed
packages on device.
• Window manager:-It is use to create views and layouts.
• Telephony manager:-It is use to handle settings of network
connection and all information about services on device.

18. APPLICATION LAYER
•the final layer on top is Applications.
•It includes the home application the contacts
application , the browser, and apps.
•It is the most upper layer in android architecture.
•All the applications like camera, Google maps,
browser,sms,calendars,contacts are native
applications. These applications works with end user
with the help of application framework to operate.

19. Security
Android is a multi-process system, in which each
application (and parts of the system) runs in its own
process. Most security between applications and the
system is enforced at the process level through
standard Linux facilities, such as user and group IDs
that are assigned to applications.

20. Contd..
Android is designed having multi layer security which provides
flexibility for this platform. When attackers attempt attack on device,
android platform help to reduce the portability of the attack.
There are key components of android security which are described as
follows:
 Design review:-when a security model is designed then it will be
reviewed by the developers so that risk level will be very less while
using the model.
 Code review and penetrating testing:-the goal of this code review is
that in which it will be checked that how the system will become
strong?
 Open source and community review:-android uses open source
technologies that have significant external review such as Linux
kernel.
 Incident response:-android team enables the rapid mitigation of
vulnerabilities to ensure that potential risks to all android users are
minimized.

21. FEATURES OF ANDROID
 Background Wi-Fi location still runs even when
Wi-Fi is turned off
Developer logging and analyzing enhancements
It is optimized for mobile devices.
It enables reuse and replacement of components.
Java support ,media support, multi touch, video
calling,multi tasking ,voice based features, screen
capture, camera ,bluetooth,gps,compass and
accelerometer,3G

22. ADVANTAGES
•The ability for anyone to customize the Google Android
platform
•It gives you better notification.
•It lets you choose your hardware.
•It has better app market(1,80,000 application)
•A more mature platform
• With the support of many applications, the user can
change the screen display.
•With Google chrome you can open many window at
once.
• Supports all Google services: Android operating system
supports all of Google services ranging from Gmail to Google
reader. all Google services can you have with one operating
system, namely Android.

23. DIS-ADVANTAGES
Android Market is less control of the manager,
sometimes there are malware.
Wasteful Batteries, This is because the OS is a lot of
"process" in the background causing the battery
quickly drains.
Sometimes slow device company issued an official
version of Android your own .
Extremely inconsistence in design among apps.
Very unstable and often hang or crash.

24. LIMITATIONS OF ANDROID
Development requirements in
•Java
•Android SDK
•Eclipse IDE (optional)
•Bluetooth limitations:-
Android doesn't support:
 Bluetooth stereo
 Contacts exchange
 Modem pairing
 Wireless keyboards
•Firefox mobile isn't coming to android because of android
limitations
Apps in Android Market need to be programmed with a custom form of
Java
→ Mozilla and the Fennec won't have that
•There are no split or interval times available.
•Small memory size.
•Continuous Internet connection is required

26. CONCLUSION
We hope that the next versions
of Android have overcome the actual
limitations and that the future possibilities
became a reality and may this software is
also developed to use in PC’s also.

27. References
http://en.wikipedia.org/wiki/Android_(operating_system)
http://www.openhandsetalliance.com/android_overview.html
http://www.android.com

28. THANK YOU

29. Akshita varshney
B.Tech(cs1)