code: @Override
      public void onConfigurationChanged(Configuration newConfig) {
          super.onConfigurationChanged(newConfig);
  
          mTitleView = null;
          mSubtitleView = null;
          mTitleUpView = null;
          if (mTitleLayout != null && mTitleLayout.getParent() == this) {
              removeView(mTitleLayout);
          }
          mTitleLayout = null;
          if ((mDisplayOptions & ActionBar.DISPLAY_SHOW_TITLE) != 0) {
              initTitle();
          }
  
          if (mTabScrollView != null && mIncludeTabs) {
              ViewGroup.LayoutParams lp = mTabScrollView.getLayoutParams();
              if (lp != null) {
                  lp.width = LayoutParams.WRAP_CONTENT;
                  lp.height = LayoutParams.MATCH_PARENT;
              }
              mTabScrollView.setAllowCollapse(true);
          }
      }
docs: /*
  Must be public so we can dispatch pre-2.2 via ActionBarImpl.