Android Application Components

December 16, 2016 by pranjal

Filed under Android

Last modified December 16, 2016

Application components are the essential building blocks of an Android application. These components are loosely coupled by 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 −
1.Activities:They dictate the UI and handle the user interaction to the smart phone screen.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.

2.Services:They handle background processing associated with an application.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.

3.Broadcast Receivers:They handle communication between Android OS and applications.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 broadcast receiver who will intercept this communication and will initiate appropriate action.

4.Content Providers:They handle data and database management issues.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.

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