我需要获取我的Firebase数据库的最后一个孩子

我想从我的Firebase数据结构中获取最后一个孩子，在该数据结构中我只知道接收到的孩子的第一个孩子的引用

i want to get last child from my firebase data structure in which i only know the reference of received and first child of it

我尝试了这个，但是它将返回所有孩子，但是我只需要在查询limiTolast(1)中使用的最后一个孩子

i try this one but it will return all child but i need only last one that use in query limiTolast(1) like this

  DatabaseReference users = mDatabase.child("received");
      //  DatabaseReference receiver = users.child(firebaseUser.getUid());
        final DatabaseReference receiver = 
    users.child("GTjrWgpKjoeXUt4JdBJTYP1JkVT2");

        receiver.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {

                Log.d(TAG, "key count=" + postSnapshot.getKey());

                for (DataSnapshot sender: postSnapshot.getChildren()) {

                    Log.d(TAG, "sender key count=" + sender.getKey());

                }

            }


        }


        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.e("SHAN " ,databaseError.getMessage());
        }
    });