Google Play Game Services multiplayer with Activity switching

Question

In my Android game I have a turn-based multiplayer. Users wait for opponents in the lobby and whenever exactly 3 are matched, they go to a new game room together, which is a

Answer 1

The documentation explains how to use the Game Services without the BaseGameActivity whenever is needed.

For example, during signin:

https://developers.google.com/games/services/training/signin

Clicking the Sign in button should initiate the sign in flow. If you are using the BaseGameActivity base class provided in the samples, simply call the beginUserInitiatedSignIn() method. Otherwise, you must manually call the connect() method of your GamesClient object.

For your specific question, I don't think it is an issue, all the control is inside Google Play, you just need to get the GamesClient and as far as I understood, the connection made on one activity will be there if you access it from another activity (but I didn't test the multiplayer yet).