WHAT IS ANDROID?

Android is an operating system which is based on Linux with Java Programming Interface.

The Android Software Development kit provides the following necessary tools for the developing the Android Applications.

• A Compiler
• Debugger
• A device emulator
• It’s own virtual  Machine to run Android Programs

Android is primarily developed by Google It Allows:

• Background Processing
• Provides a rich user Interface library
• Supports 2-D and 3-D Graphics using the Open GL Libraries
• Access to the file system
• An embedded SQLite database

Android Application can re-use components of other applications using its different components.

Google Play (Android Market)

Google Play service is offered by Google in which programmers can offer their Android application to Android users. Google play application which is included in Google phones allows installing application. Google play also offers an update service. Google play is used to be called as Android Market.

Security and Permissions:

On an Android device, the Android system will create a unique user and group ID for every application during the development each application file cannot be accessed by anyone else except the generated user. Each application will be started is its own process. Every Android application is isolated from other running application by means of the underlying Linux Operating System. If the data is to be shared it is done is a service or Content provider.

Android also contains Permission systems. It predefines every application but can define additional permissions. An android application declares permission in its AndroidManifest.xml configuration file Permission has different levels. Some are automatically granted or rejected by the system permission will be presented before installing the application. If user denies permission application can never installed. The check of permission is done through installation permissions can neither be denied nor be granted after the installation.

All the users do not pay any attention to the permissions only few of them do and even give negative reviews on Google Play.