Constants class name

Been searching for a long time to get the Google Play services to work with games. For right now I am looking for what to write in the "Constants class name" field for "Google Play Games - Android Configuration". Would appreciate if someone could let me know on that. As for resources Definition I have some code beginning with

<?xml version="1.0" encoding="utf-8"?>
<!--
Google Play game services IDs.

Thanks in advance if anyone can help on that.