SampleAdapter.kt

class SampleAdapter : RecyclerView.Adapter<SampleViewHolder>() {

    private var itemList: List<SampleItem> by Delegates.observable(initialValue = listOf(), onChange = { property, oldValue, newValue ->
        autoNotify(oldValue, newValue)
    })

    fun setItems(itemList: List<SampleItem>) {
        this.itemList = itemList
    }
  
  (...)
  
}