code: public Bundle saveInstanceState(Bundle savedInstanceState) {
          if (savedInstanceState != null) {
              savedInstanceState.putBoolean(BUNDLE_CROSS_FADED, mCrossFadeSlidingPaneLayout.isOpen());
          }
          return savedInstanceState;
      }
docs: add the values to the bundle for saveInstanceState
  
  @param savedInstanceState
  @return