Adapter delegate implementation example

RVAdapterDelegate

class OverviewAdapter(val list: List<DisplayableItem>, clickListener: OnItemClickListener) : ListDelegationAdapter<List<DisplayableItem>>() {

    init {
        delegatesManager.addDelegate(PhotoItemDelegate(clickListener))
        delegatesManager.addDelegate(ButtonItemDelegate(clickListener))
        setItems(list)
    }
}

class PhotoItemDelegate(private val clickListener: OnItemClickListener) : AbsListItemAdapterDelegate<PhotoItem, DisplayableItem, PhotoItemDelegate.ViewHolder>() {
    
    override fun isForViewType(item: DisplayableItem, items: MutableList<DisplayableItem>, position: Int): Boolean {
        return item is PhotoItem
    }

    override fun onCreateViewHolder(parent: ViewGroup): ViewHolder {

        return ViewHolder(parent.inflate(R.layout.item_overview_photo))
                .apply {
                    editButton.setOnClickListener { view ->
                        clickListener.onItemClick(view!!, adapterPosition)
                    }
                }
    }

    override fun onBindViewHolder(item: PhotoItem, viewHolder: ViewHolder, payloads: MutableList<Any>) {
        viewHolder.titleView.text = item.title
        GlideApp.with(viewHolder.itemView)
                .load(File(viewHolder.itemView.context.filesDir, item.fileName))
                .centerCrop()
                .into(viewHolder.photoView)
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        val titleView: TextView = itemView.titleText
        val photoView: ImageView = itemView.imageView
        val editButton: ImageView = itemView.editBtn
    }
}

//extension method
fun ViewGroup.inflate(layoutRes: Int): View {
    return LayoutInflater.from(context).inflate(layoutRes, this, false)
}

https://github.com/googlemaps/android-samples/blob/7ee737b8fd6d39c77f8b3716ba948e1ce3730e61/ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/LiteListDemoActivity.kt
sample for releasing objects of recyclerView