Broadcast Receiver

Broadcast receiver handle broadcast intents like boot completed, alarm etc. You need to declare the class in AndroidManifest.xml file and implement an interface

<receiver android:permission="android.permission.RECEIVE_BOOT_COMPLETED" 
      android:name=".MyReceiver" 
           android:enabled="true" 
           android:exported="false" > 
           <intent-filter> 
               <action android:name="android.intent.action.BOOT_COMPLETED" /> 
               <category android:name="android.intent.category.LAUNCHER" /> 
           </intent-filter> 
</receiver> 

Implementing the interface

public class MyReceiver extends BroadcastReceiver {   

    @Override
    public void onReceive(Context context, Intent intent) {
          // implement
    }
}