SharedPrefences Problem

SharedPreferences cannot be called from outside onCreate()

public class MainActivity extends Activity implements
        SoundPool.OnLoadCompleteListener,
        View.OnClickListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener
{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layout.activity_main);


        SharedPreferences loginState =getSharedPreferences("loginState", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = loginState.edit();

..
..
} //END ONCREATE


    @Override
    public void onConnected(Bundle connectionHint) {
        // The player is signed in. Hide the sign-in button and allow the
        // player to proceed.

HERE WE WANT TO COMMIT

    } 
} // END MAIN ACTIVITY