firebase on Data Change is called multiple times in add value event listener

Question

I have set two listeners

1. Query to get the last message
2. If the last message is group type I'm getting group info using group Listener

However, when I get the type from the message using messageListener and set groupListener it returns multiple onDataChange Debug.e("parentsnap",dataSnapshot.getValue().toString()); gets called more than one times How should I do it, please guide

    groupListener = new ValueEventListener() {
        @SuppressWarnings("unchecked")
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Debug.e("parent snap", dataSnapshot.getValue().toString());
            for (DataSnapshot d :
                    dataSnapshot.getChildren()) {
           //my code
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    };
    groups.child(chatId).addValueEventListener(groupListener);

Answer 1

If you need to receive data one time you need to use addListenerForSingleValueEvent(...) instead of addValueEventListener(...). Then onDataChange() will return only one time