PushIntentService.java

public class PushIntentService extends IntentService {

    @Override
    protected void onHandleIntent(Intent intent) {
        handleNotification(intent.getExtras());
    }

    private void handleNotification(Bundle extras) {
        NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        Notification notification = extras.getParcelable(Extras.NOTIFICATION);

        if (notification == null) {
            return;
        }

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(notification.title)
                .setContentText(notification.message)
                .setAutoCancel(true);

        mNotificationManager.notify("default-push", 1, mBuilder.build());
    }

}