android - 为 GridLayoutManager 设置完整跨度

Question

我必须创建一个异构的 RecyclerView。默认列数为 2，但某些项目需要全宽。我在像这样使用 StaggeredGridLayoutManager 时拥有它:

    @Override
    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
        int viewType = getItemViewType(position);
        FeedItems currentItem = getItem(position);
        StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) holder.itemView.getLayoutParams();
        switch (viewType) {
            case ITEM_TYPE_HEADER:
                final HeaderItem headerItem = currentItem.getHeaderItem();
                layoutParams.setFullSpan(true);
        }
    }

我如何为 GridLayoutManager 做同样的事情，我可以在其中根据不同的 View 类型轻松切换跨度？

Answer 1

有一个方法void setSpanSizeLookup (GridLayoutManager.SpanSizeLookup spanSizeLookup) .像这样使用它:

mLayoutManager = new GridLayoutManager(getActivity(), 2);
mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            switch(mAdapter.getItemViewType(position)){
                case 1:
                    return 1;
                case 2:
                    return 2;
                default:
                    return -1;
            }
        }
    });

mRecyclerView.setLayoutManager(mLayoutManager);