android – 从Google Play用户界面检测退出

Boolean mExplicitSignOut = false;
Boolean mInSignInFlow = false; // set to true when you're in the middle of the
                           // sign in flow,to kNow you should not attempt
                           // to connect in onStart()
GoogleApiClient mGoogleApiClient;  // initialized in onCreate

@Override
protected void onStart() {
   super.onStart();
   if (!mInSignInFlow && !mExplicitSignOut) {
    // auto sign in
    mGoogleApiClient.connect();
   }
}

@Override
public void onClick (View view) {
if (view.getId() == R.id.sign_ouT_Button) {
    // user explicitly signed out,so turn off auto sign in
    mExplicitSignOut = true;
    if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
        Games.signOut(mGoogleApiClient);
        mGoogleApiClient.disconnect();
    }
}
}