Android 滚动RecyclerView加载图片时的流畅度优化

沉舟侧畔千帆进,病树前头万木春。这篇文章主要讲述Android 滚动RecyclerView加载图片时的流畅度优化相关的知识,希望能为你提供帮助。
实现:使用onScrollStateChanged回调检测滚动状态,并在RecyclerViewAdapter内部设置类似isScrolling的状态值来控制网络图片的加载。 
下面是代码举例:

// BaseAdapter中添加如下代码 public abstract class BaseRecyclerViewAdapter< T> extends RecyclerView.Adapter< RecyclerView.ViewHolder> { … … protected boolean isScrolling = false; … … public void setScrolling(boolean scrolling) { isScrolling = scrolling; } }

具体的子Adapter实现:
// 在子Adapter中的onBind里进行控制 public class SubRecyclerViewAdapter extends BaseRecyclerViewAdapter< DataGuardRanking> { … … @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) { RecyclerViewHolder holder = (RecyclerViewHolder) viewHolder; … … if (!TextUtils.isEmpty(data.getAvatarUrl()) & & !isScrolling) { // 这里可以用Glide等网络图片加载库 } else { holder.avatarImg.setImageResource(占位图本地资源); } super.onBindViewHolder(holder, position); } }

在UI层进行监听:
// 外部对RecyclerView设置监听 mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { // 查看源码可知State有三种状态:SCROLL_STATE_IDLE(静止)、SCROLL_STATE_DRAGGING(上升)、SCROLL_STATE_SETTLING(下落) if (newState == SCROLL_STATE_IDLE) { // 滚动静止时才加载图片资源,极大提升流畅度 mRecyclerViewAdapter.setScrolling(false); mRecyclerViewAdapter.notifyDataSetChanged(); // notify调用后onBindViewHolder会响应调用 } else mRecyclerViewAdapter.setScrolling(true); super.onScrollStateChanged(recyclerView, newState); } }); mRecyclerView.setAdapter(mRecyclerViewAdapter);

【Android 滚动RecyclerView加载图片时的流畅度优化】 

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