如何在Kotlin中使用密封类实现ViewHolder

问题描述

我在此推文中看到了一个有趣的Viewholder实现 https://twitter.com/AndroidDev/status/972502799496790018

I saw an interesting viewholder implementation in this tweet https://twitter.com/AndroidDev/status/972502799496790018

override fun onBindViewHolder(holder: SealedAdapterViewHolder, position: Int) {
  return when (holder) {
    is HeaderHolder -> holder.displayHeader(items[position])
    is DetailsHolder -> holder.displayDetails(items[position])
  }
}

不幸的是，我不知道如何实现thouse持有人.而且我没有找到这个技巧的任何例子.

Unfortunately i can't figure out how to implement thouse holders. And I didn't find any examples of this trick.

在我的视图持有人中，我必须扩展RecyclerView.ViewHolder，并且必须扩展密封类，以便可以在"when子句"中使用它.不允许多次骚扰.

In my viewholders I have to extend RecyclerView.ViewHolder and I have to extend sealed class so i can use it in "when clauses". Multiple inharitance is not allowed.

那么有可能吗?如果有的话怎么呢?

So is it possible and if it is then how?

P.S.

原始作者这样写:

推荐答案

类似以下内容:

sealed class SealedAdapterViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

    class HeaderHolder(view: View) : SealedAdapterViewHolder(view)

    class DetailsHolder(view: View) : SealedAdapterViewHolder(view)
}

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