title: How can I make the Play Game Services not automatically sign in at the startup?
body: <p>Google provides the <code>BaseGameUtils</code> library, and <a href="https://developers.google.com/games/services/android/init">recommend us to extends its <code>BaseGameActivity</code></a>. However, this class makes the game automatically sign in whenever the game is started. If the player does not want to or cannot connect to his Google account, this can be <strong>very time consuming</strong> at the beginning of the game. </p>
  
  <p>So I dont' want this feature. Instead, I want to provide a sign in button. The player is connected only when he click that button. <em>And from that point on, every time the player starts the game, he is automatically connected to his Google account without clicking any button</em>. How can I do this?</p>