RecyclerView实现Card Gallery效果，替代ViewPager方案。能够快速滑动并最终定位到居中位置
录制效果有点渣，见谅~ 可下载apk自己玩
调用new PageScaleHelper().attachToRecyclerView(mRecyclerView);扩展RecyclerView
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.setAdapter(new CardAdapter());
// mRecyclerView绑定scale效果
new CardScaleHelper().attachToRecyclerView(mRecyclerView);
在adapter相应的位置调用
mCardAdapterHelper.onCreateViewHolder(parent, itemView);
mCardAdapterHelper.onBindViewHolder(holder.itemView, position, getItemCount());
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