This is a sample project used to study "Google game services". It is based on Google sample games
Just clone this repository and be sure to change me.palazzetti namespace so it matches yours. After that, just configure your Google Play Game Services.
Inside res/values/ids.xml you can configure your application id, all your achievements and leaderboards tokens. Go to your Developer console and link your app to create OAuth2 client so you can add all achievements and leaderboards according to this game (see above file).
Make this project a valid playground for everyone who want to start developing Android games.