How to stop new push notification being replaced by the old one in Firebase?

Question

When I trigger a push notification then the old one is replaced by new one. But I want it should add to that old notification.

My MyFirebaseMessaging class is:

Answer 1

you have to do like below

private final static AtomicInteger c = new AtomicInteger(0);

    public static int getID() {
        return c.incrementAndGet();
    }

your list line should be replace with below

notificationManager.notify(getID(), notificationBuilder.build());

Answer 2

new push notification is replaced the old one in firebase push notification in my application,How i will stop this

You need to pas different notificationID in notificationManager.notify()

SAMPLE CODE

Date myDate = new Date();
int myNotificationId = Integer.parseInt(new SimpleDateFormat("ddhhmmss",  Locale.US).format(myDate));
notificationManager.notify(myNotificationId,notificationBuilder.build());