• 註冊特殊廣播接收者

public class MyService extends Service {

    private MyReceiver myReceiver;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        myReceiver = new MyReceiver();
        IntentFilter filter 
 
= new IntentFilter();
        filter.addAction("android.intent.action.SCREEN_OFF");
        filter.addAction("android.intent.action.SCREEN_ON");
        registerReceiver(myReceiver,filter);
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        unregisterReceiver(myReceiver);
        
 
super.onDestroy();
    }
}