A broadcast receiver is an Android component that allows an app to register to receive notifications for system-wide or application-specific events. When an event occurs, all receivers registered for that event receive an intent in their onReceive() method. For example, apps can register for the ACTION_BOOT_COMPLETED event to perform tasks after system boot. Receivers are lightweight and may be recycled by the system after onReceive() finishes. They can be registered statically in the manifest or dynamically at runtime via Context.registerReceiver(). The BroadcastReceiver class must be extended to implement the onReceive() callback.

1. Android
Broadcast
Receiver
Android Training
By Khaled Anaqwa

2. Broadcast Receiver
 A broadcast receiver (short receiver) is an
Android component which allows you to
register for system or application events.
 All registered receivers for an event will be
notified by the Android runtime once this
event happens.
 For example applications can register for the
ACTION_BOOT_COMPLETED system event
which is fired once the Android system has
completed the boot process.

3. Lifecycle of a broadcast
receiver
 After the onReceive() of the
BroadcastReceiver has finished, the
Android system can recycle the
BroadcastReceiver.

4. System broadcasts
 Several system events are defined as final
static fields in the Intent class.

5. Important system events

6. Implementation
 A receiver can be registered via the
AndroidManifest.xml file.
 Alternatively to this static registration, you
can also register a broadcast receiver
dynamically via the
Context.registerReceiver() method.
 The implementing class for a receiver
extends the BroadcastReceiver class.

7. In AndroidManifest.xml
<receiver android:name=“.MyReciver" >
intent-filter>
<action
android:name="android.intent.action.ACTION_POWE
R_CONNECTED" />
</intent-filter>
</receiver>

8. BroadcastReceiver Imp
public class MyReciver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,
"Yor Mobile Will be Charge… !",
Toast.LENGTH_LONG).show();
}
}

9. Register a broadcast receiver
dynamically
registerReceiver(new MyReciver(), filter);
unregisterReceiver(MyReciver)