android - RecyclerView 无法识别 View 持有者

Question

我正在通过构建一个应用程序来学习 Kotlin，现在，我正在尝试为我的 RecyclerView 创建一个适配器。但是，我为我的 ViewGroup 选择的名称标记为 Unresolved Reference。我对 Kotlin 还很陌生，所以我知道我会犯一个愚蠢的错误，但在这种情况下，我不知道我做错了什么。

class RecyclerAdapter: RecyclerView.Adapter<RecyclerAdapter.PosterHolder>(){

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    override fun getItemCount(): Int {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    override fun onBindViewHolder(holder: RecyclerAdapter.PosterHolder, position: Int) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

}

class PosterHolder (v: View) : RecyclerView.ViewHolder(v), View.OnClickListener {
    override fun onClick(p0: View?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }
}

Answer 1

试试这个来修复:

class RecyclerAdapter : RecyclerView.Adapter<RecyclerAdapter.PosterHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PosterHolder? {
        return null
    }

    override fun onBindViewHolder(holder: PosterHolder, position: Int) {

    }

    override fun getItemCount(): Int {
        return 0
    }

    inner class PosterHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
}

And to convert java file to kotlin file with Android Studio, choosing Code->Convert java file to kotlin file.