AsyncListDiffer实际上是DifferUtil+Async，对DifferUtil进行了封装，实现数据比较时在异步线程，任务完成自动切换到主线程更新UI；
对AsyncListDiffer的使用可以直接参考或者继承androidx.recyclerview.widget.ListAdapter，里面直接做了这部分工作，将更新后的数据集合直接submit就可以了；

原理，很简单

private static class MainThreadExecutor implements Executor {
    final Handler mHandler = new Handler(Looper.getMainLooper());
    MainThreadExecutor() {}
    @Override
    public void execute(@NonNull Runnable command) {
        mHandler.post(command);
    }
}
public AsyncDifferConfig<T> build() {
    if (mBackgroundThreadExecutor == null) {
        synchronized (sExecutorLock) {
            if (sDiffExecutor == null) {
                sDiffExecutor = Executors.newFixedThreadPool(2);
            }
        }
        mBackgroundThreadExecutor = sDiffExecutor;
    }
    return new AsyncDifferConfig<>(
            mMainThreadExecutor,
            mBackgroundThreadExecutor,
            mDiffCallback);
}

示例

class RecyclerViewAdapter(diffCallback: ItemCallback<User>) : ListAdapter<User, UserViewHolder>(diffCallback) {
    constructor() : this(object : ItemCallback<User>() {
        override fun areItemsTheSame(oldItem: User, newItem: User): Boolean {
            return oldItem == newItem
        }

        override fun areContentsTheSame(oldItem: User, newItem: User): Boolean {
            return oldItem.name == newItem.name
        }
    })

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): UserViewHolder {
        return UserViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.adapter_item_recyclerview, parent, false))
    }

    override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
        holder.itemView.tv_text.text = getItem(position).toString()
        holder.itemView.setOnClickListener { v -> Toast.makeText(v.context, "点击：$position", Toast.LENGTH_SHORT).show() }
    }
}