stuff

@Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                /*String message = dataSnapshot.getValue(String.class);
                Log.v("E_VALUE", message);
                mMessages.add(message);
                adapter.notifyDataSetChanged();*/

                Map<String, String> map = dataSnapshot.getValue(Map.class);
                String message = "The date was " + map.get("Date") + " and the cost was " + map.get("Cost");
                Log.v("E_VALUE", message);
                mMessages.add(message);
                adapter.notifyDataSetChanged();

            }