/** After creating view, Callback to notify activity bind Play service. */
@Override
public void onStart() {
super.onStart();
L.l("fragment", "onViewCreated");
mActivity.allowBindService();
}
/** When stop， callback notify activity to unbind PlayService */
@Override
public void onStop() {
super.onStop();
L.l("fragment", "onDestroyView");
mActivity.allowUnbindService();
}