create an "ongoing" notification android

Question

I can't find a way to create an "ongoing" notification - I actually am not sure this kind of notification is even called that way - like in the photo below :

Grey Notification Messenger

How could I achieve that with my notification (Pinger)? My notification is created for a foreground service so I don't no if what I'm asking is possible.

Thanks for your help.

Edit : The answers that you can find herre (Android: How to create an "Ongoing" notification?) did not solve my problem. This question is not a duplicate.

My code :

Intent showTaskIntent = new Intent(getApplicationContext(), BackingService.class);
    showTaskIntent.setAction(Intent.ACTION_MAIN);
    showTaskIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    showTaskIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    Intent detailsIntent = new Intent(BackingService.this, DetailsActivity.class);
    detailsIntent.putExtra("EXTRA_DETAILS_ID", 42);
    PendingIntent contentIntent = PendingIntent.getActivity(
            getApplicationContext(),
            0,
            showTaskIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent replyPendingIntent = null;
    if (Build.VERSION.SDK_INT < 24) {
        replyPendingIntent = contentIntent;
    } else {
        replyPendingIntent = PendingIntent.getBroadcast(
                BackingService.this,
                0,
                new Intent(BackingService.this, FromNotifSender.class),
                PendingIntent.FLAG_UPDATE_CURRENT
        );
    }
    RemoteInput remoteInput = new RemoteInput.Builder(KEY_NOTIFICATION_REPLY)
            .setLabel("Tapez votre message ici")
            .build();
    android.support.v4.app.NotificationCompat.Action replyAction = new android.support.v4.app.NotificationCompat.Action.Builder(
            0, "Envoyer à "+usernamefriend, replyPendingIntent)
            .addRemoteInput(remoteInput)
            .build();
    android.support.v4.app.NotificationCompat.Builder miBuilder = new NotificationCompat.Builder(BackingService.this)
            .setSmallIcon(R.drawable.logo4)
            .setContentTitle(getString(R.string.app_name))
            .setContentText(contentText)
            .setWhen(System.currentTimeMillis())
            .setContentIntent(contentIntent)
            .setAutoCancel(false)
            .setOngoing(true)
            .setColor(getResources().getColor(R.color.colorPrimaryDark));
    if (Build.VERSION.SDK_INT < 24) {
    } else {
        if(usernamefriend.equalsIgnoreCase("un ami")){

        }else{
            miBuilder.addAction(replyAction);
        }

    }
    Intent resultIntent = new Intent(BackingService.this, SearchActivity.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(BackingService.this);
    stackBuilder.addParentStack(SearchActivity.class);
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
            stackBuilder.getPendingIntent(
                    0,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
    miBuilder.setContentIntent(resultPendingIntent);
    startForeground(002, miBuilder.build());

As you can see, .setOngoing(true) doesn't work for me.

SOLUTION

You only have to set the priority of your notification to Notification.PRIORITY_MIN as in the code following :

android.support.v4.app.NotificationCompat.Builder miBuilder = new NotificationCompat.Builder(BackingService.this)
            .setSmallIcon(R.drawable.logo4)
            .setContentTitle(getString(R.string.app_name))
            .setContentText(contentText)
            .setWhen(System.currentTimeMillis())
            .setContentIntent(contentIntent)
            .setAutoCancel(false)
            .setOngoing(true)
            .setColor(getResources().getColor(R.color.colorPrimaryDark))
            .setPriority(Notification.PRIORITY_MIN);

Answer 1

public void showNotification() {
 Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
 NotificationManager nMN = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 Notification n  = new Notification.Builder(this)
 .setContentTitle("Notification Title")
 .setContentText("Notification content")
 .setSmallIcon() //set your icon
 .setVibrate(new long[] { 1000, 1000 })
 .setLights(Color.BLUE, 700, 500)
 .setSound(alarmSound)
 .setOngoing(true)
 //.setStyle(new NotificationCompat.BigTextStyle(NorProv))
 .build();
 nMN.notify(NOTIFICATION_ID, n);
}

UPDATE

Assign Notification.FLAG_ONGOING_EVENT flag to your Notification like so :

notif.flags = Notification.FLAG_ONGOING_EVENT;

UPDATE #2

This is used to set priorities to your notification:

.setPriority(Notification.PRIORITY_LOW);
 //other priorities: MIN, HIGH, DEFAULT, MAX

To hide the icon just try to remove the .setSmallIcon() and only use a .setLargeIcon()

Answer 2

Here is what I did. When you are running a foreground service it forces you to have a persistent/ongoing notification. If you dont, then your not running a foreground service. The trick is the onStartCommand() override and startsticky command. This should be within your service. use onStartCommand instead of onCreate. and be sure to startForeground.

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // Let it continue running until it is stopped.
    /*
    Do Work
    */

    Notification notification = new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.ic_image)
        .setContentText("Display Text")
        .setPriority(Notification.PRIORITY_LOW).build();

    startForeground(MyConstants.NOTIF_SERVICE, notification);
    return START_STICKY;
}