How to keep hover active when app is closed ? about hover HOT 5 CLOSED

public void showNotification() {
    CharSequence tickerText = "asdads";
    CharSequence tickerContent = BuildConfig.VERSION_NAME;
    PendingIntent downloadManagerPendingIntent = PendingIntent.getActivity(this, 0, new Intent("android.intent.action.VIEW_DOWNLOADS").addFlags(1073741824).addFlags(67108864), 0);

    Application application = getApplication();
    getApplication();
    this.notificationManager = (NotificationManager) application.getSystemService(Context.NOTIFICATION_SERVICE);

    this.serviceNotification =  new NotificationCompat.Builder(this)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("Hover active")
            .setContentText("1 tab")
            .setOngoing(false).setPriority(-2).build();
    startForeground(7524583, this.serviceNotification);
}

    public void onCreate() {
        Log.d(TAG, "onCreate()");

        showNotification();

        mPrefs = getSharedPreferences(PREF_FILE, Context.MODE_PRIVATE);

        mHoverMenu = new HoverMenuBuilder(getContextForHoverMenu())
                .displayWithinWindow()
                .useNavigator(createNavigator())
                .useAdapter(createHoverMenuAdapter())
                .restoreVisualState(loadPreferredLocation())
                .build();
        mHoverMenu.addOnExitListener(mWindowHoverMenuMenuExitListener);
    }