ListAdapter(base)1.kt

class CustomViewHolder : BaseViewHolder<CustomViewHolder>() {
    private var tvTitle : TextView? = null
    private var tvItem : TextView? = null

    override fun onCreate() : CustomViewHolder = CustomViewHolder()

    override fun onBind(view : View): CustomViewHolder {
        tvTitle = view.tv_title
        tvItem = view.tv_item
        return this
    }

    override fun <ITEM> onSet(item: ITEM) {
        when(item) {
            is Item -> {
                tvTitle?.text = item.title
                tvItem?.text = item.item
            }
        }
    }
}

ListAdapter(base)2.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    
    val adapter = BaseListViewAdapter<Information,CustomViewHolder> (
        R.layout.listview_item,
        CustomViewHolder()
    )
    adapter.replaceAll(createList())
    lv_list.adapter = adapter
}

ListAdapter(base)3.kt

class BaseListViewAdapter<ITEM : Any, VH : BaseViewHolder<VH>>(
    private val layoutResId: Int,
    private val items: List<ITEM>,
    private var viewHolder: VH
) : BaseAdapter() {

    // ...중략
    
    override fun getView(position: Int, view: View?, parent: ViewGroup?): View? {
        var convertView = view
        when (convertView) {
            null -> {
                convertView = LayoutInflater.from(parent?.context).inflate(layoutResId, parent, false)
                viewHolder = (viewHolder).onCreate()
                convertView.tag = viewHolder.onBind(convertView)
            }
            else -> {
                viewHolder = convertView.tag as VH
            }
        }
        viewHolder.onSet(items[position])

        return convertView
    }
}

ListAdapter(base)4.kt

abstract class BaseViewHolder<VH> {
    abstract fun onCreate(): VH // ViewHolder를 생성한다.
    abstract fun onBind(view: View): VH // findViewById로 리소스를 바인딩한다.
    abstract fun <ITEM> onSet(item: ITEM) // View의 값을 변경한다.
}