code: public DrawerBuilder withStickyHeader(@LayoutRes int stickyHeaderRes) {
          if (mActivity == null) {
              throw new RuntimeException("please pass an activity first to use this call");
          }
  
          if (stickyHeaderRes != -1) {
              //i know there should be a root, bit i got none here
              this.mStickyHeaderView = mActivity.getLayoutInflater().inflate(stickyHeaderRes, null, false);
          }
  
          return this;
      }
docs: Add a sticky header below the DrawerBuilder ListView defined by a resource.
  
  @param stickyHeaderRes
  @return