Android Components

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Application Components

Application components are the essential building blocks of an Android application. These components are loosely coupled with the application manifest file AndroidManifest.xml that describes each component of the application and how they interact.

There are following four main components that can be used within an Android application:

Components

Description

Activities
They dictate
the UI and handle the user interaction with the smartphone screen
Services
They handle
background processing associated with an application.
Broadcast
Receivers
They handle
communication between Android OS and applications.
Content
Providers
They handle
data and database management issues.

Activities

An activity represents a single screen with a user interface. 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 {
}
Image result for Android Activity
Going One Activity To Another Activity

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 {  }
Service Dont have UI
Service Don`t have any U.I element it Runs in Background

Broadcast Receivers

Broadcast Receivers simply respond to broadcast messages from other applications or from the system. For example, applications can also initiate broadcasts to let other applications know that some data has been downloaded to the device and is available for them to use, so this is a broadcast receiver who will intercept this communication and will initiate appropriate action.
A broadcast receiver is implemented as a subclass of BroadcastReceiver class and each message is broadcasted as an Intent object.
public class MyReceiver  extends  BroadcastReceiver {
}
Broadcast Receiver Example
When Battery Gets Low it Broadcast A Battery low message to phone

Content Providers

A content provider component supplies data from one application to others on request. Such requests are handled by the methods of the ContentResolver class. The data may be stored in the file system, the database or somewhere else entirely.
A content provider is implemented as a subclass of ContentProvider class and must implement a standard set of APIs that enable other applications to perform transactions.
public class MyContentProvider extends ContentProvider {
}
Whats is the Best Example for Content Provider

Example of Content Provider
All Contact is Provided by content provider to WhatsApp

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