Creating RecyclerView list adapter without extra adapter/view holder classes

listAdapter.kt

fun <T : Any, B : ViewBinding> createListAdapter(
    bindingInflater: (LayoutInflater) -> B,
    bindData: B.(T) -> Unit,
): ListAdapter<T, *> = BindingListAdapter(bindingInflater, bindData)

class BindableViewHolder<T : Any, B : ViewBinding>(
    private val binding: B,
    private val bindData: B.(T) -> Unit,
) : RecyclerView.ViewHolder(binding.root) {

    fun bindData(item: T) = binding.bindData(item)
}

open class BindingListAdapter<T : Any, B : ViewBinding>(
    private val bindingInflater: (LayoutInflater) -> B,
    private val bindData: B.(T) -> Unit,
) : ListAdapter<T, BindableViewHolder<T, B>>(ItemDiffCallback<T>()) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
        BindableViewHolder(bindingInflater(LayoutInflater.from(parent.context)), bindData)

    override fun onBindViewHolder(holder: BindableViewHolder<T, B>, position: Int) =
        holder.bindData(currentList[position])
    
    final override fun getItemCount(): Int = super.getItemCount()
}

class ItemDiffCallback<T : Any> : DiffUtil.ItemCallback<T>() {
    override fun areItemsTheSame(oldItem: T, newItem: T): Boolean = oldItem::class.java == newItem::class.java

    @SuppressLint("DiffUtilEquals")
    override fun areContentsTheSame(oldItem: T, newItem: T): Boolean = oldItem == newItem
}