RecyclerView粘性头部控件 - sticky-headers-recyclerview，Header背景不显示

RecyclerView粘性头部控件Github：timehop/sticky-headers-recyclerview

当RecycleView被SmartRefreshLayout嵌套时，会造成Header设置的背景不显示，调试源码发现在HeaderViewCache中有计算Header的宽度

....
 int widthSpec;
      int heightSpec;

      if (mOrientationProvider.getOrientation(parent) == LinearLayoutManager.VERTICAL) {
//  这里parent.getWidth()获取不到宽度
        widthSpec = View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY);
        heightSpec = View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.UNSPECIFIED);
      } else {
        widthSpec = View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.UNSPECIFIED);
        heightSpec = View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.EXACTLY);
      }

      int childWidth = ViewGroup.getChildMeasureSpec(widthSpec,
          parent.getPaddingLeft() + parent.getPaddingRight(), header.getLayoutParams().width);
      int childHeight = ViewGroup.getChildMeasureSpec(heightSpec,
          parent.getPaddingTop() + parent.getPaddingBottom(), header.getLayoutParams().height);
      header.measure(childWidth, childHeight);
....

注释的地方获取不到宽度，所以在自定义的Adapter中重新设置一下宽度

 @Override
    public ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
        ....
        // 这个粘性头部库Header宽度计算的有问题，会导致背景显示不出来,这里重新设置一下
        RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
        p.width = DensityUtil.getScreenWidth(mContext);
        view.setLayoutParams(p);
       ...
    }