Firebase event listener that calls only when the data updates android

I want to send a notification whenever the data in firebase changes. But when I use addValueEvenListener() method it returns more than once. After that I tried using addListenerForSingleValueEvent() method but it now returns 2 times, When I start the app and when the data changes. Is there a way for it to return only one time which is when the data changes and not when the app starts?

Here is my code for now:

databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                sendNotification("notification","App name",getIntent().getStringExtra("storeid"));
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });

EDIT: Just so every one understand my question. When I start the app, a notification is sent because of the code above. And I don't want this to happen, Instead I need to only send the notification when the data changes.

from Firebase event listener that calls only when the data updates android