Android 类型与Kotlin泛型适配器不匹配

我正在尝试创建一个基本适配器类，它可以被所有其他RecyclerView适配器扩展，因为它们彼此没有太大的差异

这是我的

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
}

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

我试图在其中实现它的类（

LessonsRecycleServiceAdapter

）中的一个片段：

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
    }

---

当

LessonsViewHolder

扩展

BaseViewHolder

？

这是因为您混合了类型

T

和

Any

，请尝试以下操作：
BaseViewHolder

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

抽象类BaseViewHolder（覆盖val containerView:View）：
RecyclerView.ViewHolder（容器视图），
布局容器

BaseViewAdapter

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

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

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

    override fun onBindViewHolder(holder: BaseViewHolder<T>, 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
}

抽象类BaseAdapter(
@LayoutRes open val layoutId:Int，
私有val数据列表：ArrayList？
)：RecyclerView.Adapter（）{
抽象有趣的setViewHolder（父：ViewGroup）：BaseViewHolder
抽象趣味绑定（containerView:View，item:T）
重写CreateViewHolder（父级：ViewGroup，viewType:Int）：BaseViewHolder{
返回setViewHolder（父级）
}
覆盖BindViewHolder（holder:BaseViewHolder，位置：Int）{
绑定（holder.containerView，dataList！！[position]）
}
重写fun getItemCount（）：Int=dataList！！.size
覆盖getItemViewType（位置：Int）：Int=
如果（dataList！！.size==0）为空，则其他为非空
}

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

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

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

    override fun onBindViewHolder(holder: BaseViewHolder<T>, 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
}