public class MainActivity extends LocationManagingActivity implements ActionBar.OnNavigationListener,
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener {

    //...

    private static MeTrackerStore mMeTrackerStore;

    //...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //...

        mMeTrackerStore = new MeTrackerStore(this);
    }
}