Architecture of Mobile Applications

1.16. Example Code

Example Code

public class MyReceiver extends BroadcastReceiver {

    @Override

    public void onReceive(Context context, Intent intent) {

        Toast.makeText(context, "Broadcast Received!", Toast.LENGTH_SHORT).show();

    }

}

Registering a Receiver in Manifest

<receiver android:name=".MyReceiver">

    <intent-filter>

        <action android:name="android.intent.action.BOOT_COMPLETED"/>

    </intent-filter>

</receiver>

Use Cases

• Detecting when the device boots up.
• Monitoring network changes.
• Handling push notifications.

These four core components—Activities, Fragments, Services, and Broadcast Receivers—are fundamental to Android app development. Each serves a distinct purpose:

• Activities manage UI interactions.
• Fragments offer reusable and flexible UI components.
• Services handle background tasks.
• Broadcast Receivers listen for and respond to system-wide events.