BindableRecyclerViewAdapter.kt

class BindableRecyclerViewAdapter : RecyclerView.Adapter<BindableViewHolder>() {

    var itemViewModels: List<ItemViewModel> = emptyList()
    private val viewTypeToLayoutId: MutableMap<Int, Int> = mutableMapOf()

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BindableViewHolder {
        val binding: ViewDataBinding = DataBindingUtil.inflate(
            LayoutInflater.from(parent.context),
            viewTypeToLayoutId[viewType] ?: 0,
            parent,
            false)
        return BindableViewHolder(binding)
    }

    override fun getItemViewType(position: Int): Int {
        val item = itemViewModels[position]
        if (!viewTypeToLayoutId.containsKey(item.viewType)) {
            viewTypeToLayoutId[item.viewType] = item.layoutId
        }
        return item.viewType
    }

    override fun getItemCount(): Int = itemViewModels.size

    override fun onBindViewHolder(holder: BindableViewHolder, position: Int) {
        holder.bind(itemViewModels[position])
    }

    fun updateItems(items: List<ItemViewModel>?) {
        itemViewModels = items ?: emptyList()
        notifyDataSetChanged()
    }
}

class BindableViewHolder(private val binding: ViewDataBinding) : RecyclerView.ViewHolder(binding.root) {

    fun bind(itemViewModel: ItemViewModel) {
        binding.setVariable(BR.itemViewModel, itemViewModel)
    }
}