private int createNotification(String title, String text) {
        String channelId = "channelId";
        String channelName = "channelName";
        String description = "description";
        String group = "group";
        int notificationId = new Random().nextInt(101);

        Intent intent = new Intent(this, FullscreenActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(this);
        NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH);
        channel.setDescription(description);
        notificationManagerCompat.createNotificationChannel(channel);

        NotificationCompat.Builder notification = new NotificationCompat.Builder(this, channelId)
                .setContentTitle(title).setContentText(text)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setContentIntent(pendingIntent)
                .setAutoCancel(true);

        notificationManagerCompat.notify(notificationId, notification.build());
        return notificationId;
    }