Simple (Paged) RecyclerViewAdapter

AppPagedRecyclerViewAdapter.kt

abstract class AppPagedRecyclerViewAdapter<BIND : ViewDataBinding, M : Any>(
    diffUtil: DiffUtil.ItemCallback<M>
) : PagedListAdapter<M, AppPagedRecyclerViewAdapter.ViewHolder<BIND>>(diffUtil) {
    
    abstract fun onCreateViewBindingHolder(inflater: LayoutInflater, parent: ViewGroup): BIND

    abstract fun onPrepareBindViewHolder(binding: BIND, model: M)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder<BIND> {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(onCreateViewBindingHolder(inflater, parent))
    }

    override fun onBindViewHolder(holder: ViewHolder<BIND>, position: Int) {
        val item = getItem(position)
        onPrepareBindViewHolder(holder.binding, item)
        holder.binding.executePendingBindings()
    }

    class ViewHolder<BIND : ViewDataBinding> constructor(val binding: BIND) :
        RecyclerView.ViewHolder(binding.root)
}

AppRecyclerViewAdapter.kt

abstract class AppRecyclerViewAdapter<BIND : ViewDataBinding, M : Any>(
    diffUtil: DiffUtil.ItemCallback<M>
) : ListAdapter<M, AppRecyclerViewAdapter.ViewHolder<BIND>>(diffUtil) {
    
    abstract fun onCreateViewBindingHolder(inflater: LayoutInflater, parent: ViewGroup): BIND

    abstract fun onPrepareBindViewHolder(binding: BIND, model: M)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder<BIND> {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(onCreateViewBindingHolder(inflater, parent))
    }

    override fun onBindViewHolder(holder: ViewHolder<BIND>, position: Int) {
        val item = getItem(position)
        onPrepareBindViewHolder(holder.binding, item)
        holder.binding.executePendingBindings()
    }

    class ViewHolder<BIND : ViewDataBinding> constructor(val binding: BIND) :
        RecyclerView.ViewHolder(binding.root)
}

RecyclerViewBindingAdapter.kt

@BindingAdapter("items")
fun <T> RecyclerView.items(items: List<T>?) {
    if (adapter != null && adapter is ListAdapter<*, RecyclerView.ViewHolder>) {
        (adapter as ListAdapter<T, RecyclerView.ViewHolder>).submitList(items)
    }
}

@BindingAdapter("pagedItems")
fun <T> RecyclerView.pagedItems(items: PagedList<T>?) {
    if (adapter != null && adapter is PagedListAdapter<*, RecyclerView.ViewHolder>) {
        (adapter as PagedListAdapter<T, RecyclerView.ViewHolder>).submitList(items)
    }
}