StaggeredList RecyclerView用于不同大小的缩略图

Question

我正在创建一个照片库，我正在使用RecyclerView来处理这个交错列表。

LEFT 一个是它应该看起来像， RIGHT 一侧显示 IT现在看起来如何。

这就是我的代码。

调用适配器的代码：

StaggeredGridLayoutManager lm = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(lm);
recyclerViewAdapter = new CustomRecyclerViewAdapter(imagesList);
recyclerView.setAdapter(recyclerViewAdapter);

适配器onCreateViewHolder函数：

final View itemView;
itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_image_thumbnail, parent, false);
itemView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    @Override
    public boolean onPreDraw() {
        final int vt = viewType;
        final ViewGroup.LayoutParams lp = itemView.getLayoutParams();
        if (lp instanceof StaggeredGridLayoutManager.LayoutParams) {
            StaggeredGridLayoutManager.LayoutParams sglp = (StaggeredGridLayoutManager.LayoutParams) lp;
            switch (vt) {
                case TYPE_LARGE:
                    sglp.setFullSpan(false);
                    sglp.width = 2*(itemView.getWidth());
                    sglp.height = sglp.width;
                    break;
                case TYPE_SMALL:
                    sglp.setFullSpan(false);
                    sglp.width = (itemView.getWidth());
                    sglp.height = sglp.width;
                    break;
            }
            itemView.setLayoutParams(sglp);
            final StaggeredGridLayoutManager lm = (StaggeredGridLayoutManager) ((RecyclerView) parent).getLayoutManager();
            lm.invalidateSpanAssignments();
    }
    itemView.getViewTreeObserver().removeOnPreDrawListener(this);
    return true;
}
});
return new CustomRecyclerViewAdapter.ViewHolder(itemView);

有人能告诉我我做错了什么吗？非常感谢！