A ListAdapter that pre-caches its views on creation

SmoothListAdapter.kt

class SmoothListAdapter(val context: Context) : ListAdapter<ListItem, ListItemViewHolder>(MyDiffCallback()) {

    data class ListItem(val id: String, val text: String)

    class ListItemViewHolder(view: View) : ViewHolder(view) {
        fun populateFrom(listItem: ListItem) {
            //TODO: populate your view
        }
    }

    companion object {
        const val NUM_CACHED_VIEWS = 5
    }

    private val asyncLayoutInflater = AsyncLayoutInflater(context)
    private val cachedViews = Stack<View>()


    init {
        //Create some views asynchronously and add them to our stack
        for (i in 0..NUM_CACHED_VIEWS) {
            asyncLayoutInflater.inflate(R.layout.list_item, null) { view, layoutRes, viewGroup ->
                cachedViews.push(view)
            }
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemViewHolder {
        //Use the cached views if possible, otherwise if we ran out of cached views inflate a new one
        val view = if (cachedViews.isEmpty()) {
            LayoutInflater.from(context).inflate(R.layout.list_item, parent, false)
        } else {
            cachedViews.pop().also { it.layoutParams = LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT) }
        }
        return ListItemViewHolder(view)
    }

    override fun onBindViewHolder(viewHolder: ListItemViewHolder, position: Int) =
        viewHolder.populateFrom(getItem(position))

    class MyDiffCallback : DiffUtil.ItemCallback<ListItem>() {
        override fun areItemsTheSame(firstItem: ListItem, secondItem: ListItem) =
                firstItem.id == secondItem.id

        override fun areContentsTheSame(firstItem: ListItem, secondItem: ListItem) =
                firstItem == secondItem
    }
}