gistfile1.kt

override fun onBindViewHolder(holder: ViewHolder,
                              position: Int,
                              payloads: MutableList<Any>) {
    if (!payloads.isEmpty()) {
        // Because these updates can be batched,
        // there can be multiple payloads for a single bind
        when (payloads[0]) {
            Payload.FAVORITE_CHANGE -> {
                // Change only the "favorite" icon,
                // leave background image alone:
                bindFavoriteIcon(holder,
                        items[position].isFavorited)
            }
        }
    }
    // When payload list is empty,
    // or we don't have logic to handle a given type,
    // default to full bind:
    super.onBindViewHolder(holder, position, payloads)
}