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 {
   
   public void onCreate(){}

}

Additional Components

There are additional components which will be used in the construction of 

above mentioned entities, their logic, and wiring between them. 

These components are −

Components
Description
Fragments

Represents a portion of user interface in an Activity.





Views




UI elements that are drawn on-screen including buttons, lists forms etc.


Layouts




View hierarchies that control screen format and appearance of the views.





Intents




Messages wiring components together.


Resources




External elements, such as strings, constants and drawable pictures.





Manifest




Configuration file for the application.