I want's to show Toast on long press of power button after app killed

Question

I'm creating an app with service that shows Toast on a long press of the power button after the app is killed.

How can I implement code that detects the long press of power button?

Here is My Service Class

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    super.onStartCommand(intent, flags, startId);

   final IntentFilter intentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    longClick = new LongClick();
    registerReceiver(longClick, intentFilter);


    // Toast.makeText(getApplicationContext(),"Service Started",Toast.LENGTH_LONG).show();
    return START_STICKY;
}

MyRecevier Class

    public class LongClick extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS))
        {
            Toast.makeText(context,"Long Click",Toast.LENGTH_LONG).show();
        }
    }
}