playgameservices/android-samples — pull request #55 by dalinaum (2014-03-03 02:11:14+00:00)
Title: Added checking whether mActivity is null.

mActivity is cleared after `onStop` is invoked. Because
`resolveConnectResult` can be invoked after `onStop` and
uses mActivity, null pointer exception may occur. So we
have to check that mActivity is not null.