BindingItem.kt

data class BindingItem<ITEM>(@LayoutRes val type: Int, val item: ITEM)

fun <T> T.toBindingItem(@LayoutRes type: Int): BindingItem<T> {
    return BindingItem(type, this)
}

DataBindingAdapter.kt

open class DataBindingAdapter<ITEM>(
    private val bindingVariableId: Int? = null,
    private val variables: Map<Int, Any>? = null,
    diffUtil: DiffUtil.ItemCallback<BindingItem<ITEM>>
) : androidx.recyclerview.widget.ListAdapter<BindingItem<ITEM>,
        BindViewHolder<BindingItem<ITEM>>>(diffUtil) {

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): BindViewHolder<BindingItem<ITEM>> {
        return DataBindingViewHolder(viewType, parent, bindingVariableId, variables)
    }

    override fun onBindViewHolder(holder: BindViewHolder<BindingItem<ITEM>>, position: Int) {
        holder.bind(getItem(position))
    }

    override fun getItemViewType(position: Int): Int {
        return getItem(position).type
    }

}

DataBindingViewHolder.kt

open class DataBindingViewHolder<ITEM>(
    @LayoutRes layoutResId: Int,
    parent: ViewGroup,
    private val bindingVariableId: Int?,
    variables: Map<Int, Any>?
) : BindViewHolder<BindingItem<ITEM>>(
    LayoutInflater.from(parent.context).inflate(layoutResId, parent, false)
) {

    private val binding: ViewDataBinding? = DataBindingUtil.bind(itemView)

    init {
        variables?.let {
            for (entry in variables) {
                binding?.setVariable(entry.key, entry.value)
            }
        }
    }

    override fun bind(item: BindingItem<ITEM>) {
        binding ?: return
        binding.setVariable(bindingVariableId ?: return, item.item)
    }
}