Notification comes in notification list but not pop ups on main screen

I am sharing two images please have a look on it you will understand my problem

in fist image notification comes successfully as shown better me notification but I want it to come and show first on main screen as shown in second image just this telegram notification.

     public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
        //        r.play();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            r.setLooping(false);
        }

        // vibration
        Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        long[] pattern = {100, 300, 300, 300};
        v.vibrate(pattern, -1);

         int resourceImage = getResources().getIdentifier(remoteMessage.getNotification().getIcon(), "drawable", getPackageName());

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "CHANNEL_ID");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            builder.setSmallIcon(R.mipmap.betterme);
        } else {
            builder.setSmallIcon(R.mipmap.betterme);
        }
        Intent resultIntent = new Intent(this, SplashScreen.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 1, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        builder.setContentTitle(remoteMessage.getNotification().getTitle());
        builder.setContentText(remoteMessage.getNotification().getBody());
        builder.setContentIntent(pendingIntent);
        builder.setStyle(new NotificationCompat.BigTextStyle().bigText(remoteMessage.getNotification().getBody()));
        builder.setAutoCancel(true);
        builder.setOngoing(true);
        builder.setPriority(NotificationCompat.PRIORITY_MAX);
        builder.setSound(notification);

        mNotificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String channelId = "Your_channel_id";
            NotificationChannel channel = new NotificationChannel(
                    channelId,
                    "Channel human readable title",
                    NotificationManager.IMPORTANCE_HIGH);
            AudioAttributes audioAttributes = new AudioAttributes.Builder()
                    .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                    .build();
            channel.setSound(notification, audioAttributes);
            mNotificationManager.createNotificationChannel(channel);
            builder.setChannelId(channelId);
        }
        mNotificationManager.notify(100, builder.build());
    }
}

first image

second image

Answer

If I understand correctly, you would like to have a heads up notification.

Note, that the android system decides when to make a notification a heads up notification and has the final say – not you the developer. Here you can find some examples when it does so: https://developer.android.com/guide/topics/ui/notifiers/notifications#Heads-up

Make sure that your setup reflects these. From your sample it seems to be the case, but maybe you have changed the notification channel settings (from the app settings), which override your code preferences (the user has precedence over the app).

Additionally, note that if you swipe the heads up notification in a upward direction (not sideways), Android starts a cool off time, where no heads up notifications from that app appears for a few seconds (or more). You can try that with Telegram or any other app as well. After the cool-off time, it starts showing up again like a heads up notification. This is a way Android utilises to prevent apps to be annoying to users.