Firebase + Android - Notifications ChildAdded - How to get only New Childs?

Question

I\'m trying to setup an Android Service in my app that listens for new Childs in a Firebase Ref, and throws a Notification when that happens.

I\'m having issues because

Answer 1

If you have a field modifiedOn, you can index that and setup a query like:

Query byModified = firebaseEndpoint.orderByChild("modifiedOn").startAt(lastInAppTime);