private void updatePlayerVoteCount(String whichHalf, String player_id, String player_name) {
        mVoteCountReference.child(whichHalf).child(NODE_PLAYER).child(player_id).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                Vote playersVotes = null;
                if (dataSnapshot != null && dataSnapshot.exists()) {
                    playersVotes = dataSnapshot.getValue(Vote.class);
                    if (playersVotes != null && playersVotes.getVotes() > 0) {
                        long votes = playersVotes.getVotes();
                        votes++;
                        playersVotes.setVotes(votes);
                    } else {
                        playersVotes = new Vote(1, player_id, player_name);
                    }
                } else {
                    playersVotes = new Vote(1, player_id, player_name);
                }
                mVoteCountReference.child(whichHalf).child(NODE_PLAYER).child(player_id).setValue(playersVotes);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Log.e(TAG, "updatePlayerVoteCount() - error - " + databaseError.getMessage());
            }
        });
    }