Andriod Core Building Blocks

The core building blocks of an Android application are components that can be used to create and manage different aspects of an application. Here are the four main components:

  1. Android Activity
  2. Android Service
  3. Android Broadcast Receiver
  4. Android Content Provider

Android Activity

In Android, an Activity is a component of the application that represents a single screen with a user interface. It is the basic building block of Android applications and is used to interact with the user and manage application state.

An Activity can be thought of as a window or a screen in an application. It can contain various UI elements such as text, images, buttons, and input fields. When a user interacts with an Activity, the Activity can perform actions such as retrieving data from a database, processing user input, or updating the UI.

Here are some common uses of Android Activities:

  1. Displaying user interfaces: An Activity is typically used to display a user interface to the user. This can include anything from a simple login screen to a complex form with multiple fields.
  2. Responding to user input: Activities are designed to respond to user input such as clicks, swipes, and other gestures. When a user interacts with an Activity, it can perform various actions such as updating data or launching another Activity.
  3. Managing application state: Activities can be used to manage the state of an application. For example, an Activity may be used to save data to a database or to retrieve data from a server.
  4. Launching other activities: An Activity can be used to launch other activities within an application. This can be useful for creating workflows where the user is guided through a series of steps.

To create an Android activity, you have to extend the Activity class. Example is given below.

Syntax of extend Activity Class

  public class demo extends Activity
      {
      }

Overall, the Activity component is an essential part of Android applications and is used extensively to create rich user experiences and manage application state.

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