My Life with Android
Introduction Android Componets UserInterface Advanced UI Data Storage Advanced Concepts Others New Studio

Introduction

Application components are the essential building blocks of an Android application.
There are following four main components that can be used within an Android application:
SNO Components Description
1 Activities They dictate the UI and handle the user interaction to the smart phone screen
2 Services They handle background processing associated with an application.
3 Broadcast Receivers They handle communication between Android OS and applications.
4 Content Providers They handle data and database management issues.

1. Activities

An activity represents a single screen with a user interface,in-short Activity performs actions on the screen. For example, an email application might have one activity that shows a list of new emails, another activity to compose an email, and another activity for reading emails. If an application has more than one activity, then one of them should be marked as the activity that is presented when the application is launched.

An activity is implemented as a subclass of Activity class as follows:

public class MainActivity extends Activity {

}

2. Services

A service is a component that runs in the background to perform long-running operations. For example, a service might play music in the background while the user is in a different application, or it might fetch data over the network without blocking user interaction with an activity.

A service is implemented as a subclass of Service class as follows :

public class MyService extends Service {

}

3. Broadcast Receivers

Broadcast Receivers simply respond to broadcast messages from other applications or from the system.

A broadcast receiver is implemented as a subclass of BroadcastReceiver class and each message is broadcaster as an Intent object.

public class MyReceiver  extends  BroadcastReceiver {

   public void onReceive(context,intent){}

}

4. Content Providers

A content provider component supplies data from one application to others on request.

A content provider is implemented as a subclass of ContentProvider class as follows :

public class MyContentProvider extends  ContentProvider {
   public void onCreate(){}

}

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Eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.

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