我正在尝试创建一个基适配器类，它可以被所有其他的RecycerView适配器扩展，因为它们之间没有太大的差别。

下面是我的BaseAdapter类:

private const val IS_EMPTY = 0
private const val IS_NOT_EMPTY = 1

abstract class BaseAdapter<T>(
    @LayoutRes open val layoutId: Int,
    private val dataList: ArrayList<T>?
) : RecyclerView.Adapter<BaseViewHolder<Any>>() {

    abstract fun setViewHolder(parent: ViewGroup): BaseViewHolder<Any>
    abstract fun bind(containerView: View, item: T)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder<Any> {
        return setViewHolder(parent)
    }

    override fun onBindViewHolder(holder: BaseViewHolder<Any>, position: Int) {
        bind(holder.containerView, dataList!![position])
    }

    override fun getItemCount(): Int = dataList!!.size

    override fun getItemViewType(position: Int): Int = if (dataList!!.size == 0) IS_EMPTY else IS_NOT_EMPTY
}

下面是我的BaseViewHolder类:

abstract class BaseViewHolder<in T: Any>(override val containerView: View) : RecyclerView.ViewHolder(containerView),
    LayoutContainer

我试图在其中实现的类(LessonsRecyclerViewAdapter)的片段:

override fun setViewHolder(parent: ViewGroup): BaseViewHolder<Any> {
        val view = LayoutInflater.from(parent.context).inflate(layoutId, parent, false)
        return LessonsViewHolder(view)
        //Type mismatch: Required: BaseViewHolder<Any> Found: LessonsRecyclerViewAdapter.LessonsViewHolder
    }

LessonsViewHolder只是一个空类，扩展了BaseViewHolder:

class LessonsViewHolder(override val containerView: View): BaseViewHolder<Lesson>(containerView)

当LessonsViewHolder扩展BaseViewHolder时，为什么会出现类型不匹配错误？