StaggeredGridLayoutManager瀑布流错乱的解决

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使用RecyclerView搭配StaggeredGridLayoutManager实现瀑布流时，一般会在Adapter的onBindViewHolder()方法里给每一个item随机生成一个高度，使得item的排布错落有致，不死板。

 @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        //存在记录的高度时先Layout再异步加载图片
        if (mList.get(holder.getAdapterPosition()).getHeight() > 0) {
            ViewGroup.LayoutParams layoutParams = holder.ivGirl.getLayoutParams();
            layoutParams.height = mList.get(holder.getAdapterPosition()).getHeight();
        }
        Glide.with(mContext).load(mList.get(position).getUrl()).asBitmap().diskCacheStrategy(DiskCacheStrategy.ALL)
                .into(new SimpleTarget<Bitmap>(App.SCREEN_WIDTH / 2, App.SCREEN_WIDTH / 2) {
                    @Override
                    public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
                        if(holder.getAdapterPosition() != RecyclerView.NO_POSITION) {
                            if (mList.get(holder.getAdapterPosition()).getHeight() <= 0) {
                                int width = resource.getWidth();
                                int height = resource.getHeight();
                                int realHeight = (App.SCREEN_WIDTH / 2) * height / width;
                                mList.get(holder.getAdapterPosition()).setHeight(realHeight);
                                ViewGroup.LayoutParams lp = holder.ivGirl.getLayoutParams();
                                lp.height = realHeight;
                            }
                            holder.ivGirl.setImageBitmap(resource);
                        }
                    }
                });
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(onItemClickListener != null) {
                    View shareView = view.findViewById(R.id.iv_girl);
                    onItemClickListener.onItemClickListener(holder.getAdapterPosition(),shareView);
                }
            }
        });
    }

 mAdapter = new GirlAdapter(mContext, mList);
        mStaggeredGridLayoutManager = new StaggeredGridLayoutManager(SPAN_COUNT,StaggeredGridLayoutManager.VERTICAL);
        rvGirlContent.setLayoutManager(mStaggeredGridLayoutManager);
        rvGirlContent.setAdapter(mAdapter);

在StaggeredGridLayoutManager瀑布流中,当需要依据图片实际相对高度,不断动态设置ImageView的LayoutParams时,
会导致快速滑动状态下产生重新排列,重写getItemViewType并设置StaggeredGridLayoutManager.GAP_HANDLING_NONE解决了这个问题，原因目前未知

  @Override
    public int getItemViewType(int position) {
        return Math.round((float) App.SCREEN_WIDTH / (float) mList.get(position).getHeight() * 10f);
    }

mStaggeredGridLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);

效果如下：