BindingAdapter

viewbinding.kt

open class BindViewHolder<VB : ViewBinding, T> : RecyclerView.ViewHolder {

    private val vb: VB

    private constructor(vb: VB) : super(vb.root) {
        this.vb = vb
    }

    constructor(parent: ViewGroup, callback: (LayoutInflater, ViewGroup, Boolean) -> VB) :
        this(parent.run { callback.invoke(LayoutInflater.from(context), this, false) })

    fun update(item: T) {
        vb.apply {
            onUpdate(item).invoke(vb)
        }
    }

    open fun onUpdate(item: T): VB.() -> Unit = {}
}

abstract class BindAdapter<T, VH : BindViewHolder<*, T>> : RecyclerView.Adapter<VH>() {

    private val data: MutableList<T> = arrayListOf()

    override fun getItemCount(): Int = data.size

    override fun onBindViewHolder(holder: VH, position: Int) {
        data.getOrNull(position)?.apply {
            holder.update(this)
        }
    }
}

Usage

class ItemVH(parent: ViewGroup) : BindViewHolder<ListItemSearchBinding, ChatMessage>(parent, ListItemSearchBinding::inflate) {

    override fun onUpdate(item: ChatMessage): ListItemSearchBinding.() -> Unit = {
        tvContent.text = item.description
    }
}

class MyAdapter : BindAdapter<ChatMessage, BindViewHolder<*, ChatMessage>>() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BindViewHolder<*, ChatMessage> {
        return when (viewType) {
            0 -> ItemVH(parent)
            else -> OtherItemVH(parent)
        }
    }
}