BaseListAdapter.kt

abstract class BaseListAdapter<T, U : ViewDataBinding>(
    callback: DiffUtil.ItemCallback<T>
) : ListAdapter<T, BaseViewHolder<T, U>>(callback) {

    abstract fun bindItem(item: T, viewBinding: U)

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): BaseViewHolder<T, U> {
        val binding = BaseViewHolder.create(parent)
        return BaseViewHolder(binding, BaseListAdapter<T, U>::bindItem)
    }

    override fun onBindViewHolder(
        holder: BaseViewHolder<T, U>,
        position: Int
    ) {
        val item = getItem(position)
        holder.bind(item)
    }

}

class BaseViewHolder<T, U : ViewDataBinding>(
    private val binding: U,
    private val bindStrategy: (item: T, viewBinding: U) -> Unit
) : RecyclerView.ViewHolder(binding.root) {

    companion object {
        fun create(parent: ViewGroup): U =
            U.inflate(LayoutInflater.from(parent.context), parent, false)
    }

    fun bind(item: T) = bindStrategy(item, binding)
}

class NoteAdapter : BaseListAdapter<Note, ItemNoteBinding>(
    object : DiffUtil.ItemCallback<Note>() {
        override fun areItemsTheSame(oldItem: Note, newItem: Note): Boolean =
            oldItem.id == newItem.id

        override fun areContentsTheSame(oldItem: Note, newItem: Note): Boolean = oldItem == newItem
    }
) {
    override fun bindItem(item: Note, viewBinding: ItemNoteBinding) {
        viewBinding.note = item
    }
}