IBaseRecyclerViewAdapter

/**
 * Created by Himanshu Singh on 27-10-2020.
 **/
abstract class IBaseRecyclerViewAdapter<Item : IRecyclerItemViewModel?>(var items: MutableList<Item>) : RecyclerView.Adapter<BaseRecyclerViewAdapter.BaseBindingViewHolder>() {
    private var position = 0
   
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseBindingViewHolder {
        // here the viewType is the actual layoutId to make it generic
        val layoutInflater = LayoutInflater.from(parent.context)
        val binding =
            DataBindingUtil.inflate(layoutInflater, viewType, parent, false) as ViewDataBinding
        val viewHolder = BaseBindingViewHolder(binding)
        position = viewHolder.adapterPosition
        registerItemClick(viewHolder, viewType, viewHolder.adapterPosition)
        return viewHolder
    }

    override fun onBindViewHolder(holder: BaseBindingViewHolder, position: Int) {
        holder.bindData(items[position])
    }

    override fun getItemViewType(position: Int): Int {
        return items[position]!!.getLayoutId()
    }

    fun getItem(holder: BaseBindingViewHolder): Item {
        return items[holder.adapterPosition]
    }

    fun updateData(data: List<Item>) {
        this.items.clear()
        this.items.addAll(data)
        notifyDataSetChanged()
    }

    fun addData(data: List<Item>) {
        this.items.addAll(data)
        notifyDataSetChanged()
    }

    fun addItem(item: Item) {
        this.items.add(item)
        notifyItemChanged(itemCount)
    }

    fun updateItem(item: Item, position: Int) {
        if (this.items.size >= position) {
            this.items[position] = item
            notifyItemChanged(position)
        }
    }

    fun removeItem(position: Int) {
        this.items.removeAt(position)
        notifyItemRemoved(position)
    }


    fun getData(): ArrayList<Item> {
        return this.items.toList() as ArrayList<Item>
    }

    fun addData(data: Item) {
        this.items.add(this.items.size - 1, data)
        notifyItemChanged(this.items.size - 1)
    }

    abstract fun registerItemClick(holder: BaseBindingViewHolder, viewType: Int, position: Int)

    override fun getItemCount(): Int {
        return items.count()
    }

    class BaseBindingViewHolder internal constructor(var binding: ViewDataBinding) :
        RecyclerView.ViewHolder(binding.root) {
        fun bindData(item: Any?) {
            (item as IRecyclerItemViewModel).let {
                for (pair in it.getBindingPairs()) {
                    binding.setVariable(pair.first, pair.second)
                }
            }
            binding.executePendingBindings()
        }
    }

    // this method is use to register the listeners in viewBinding
    open fun getListener(): Any? {
        return null
    }

    open fun getPosition(): Int {
        return position
    }
}

IRecyclerItemViewModel

interface IRecyclerItemViewModel{

    @LayoutRes
    fun getLayoutId(): Int

    fun getBindingPairs(): List<Pair<Int, Any>>

}