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;
}