Cloud Firestore collection count

Question

Is it possible to count how many items a collection has using the new Firebase database, Cloud Firestore?

If so, how do I do that?

Answer 1

firebaseFirestore.collection("...").addSnapshotListener(new EventListener() {
        @Override
        public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {

            int Counter = documentSnapshots.size();

        }
    });