NotesAdapter.kt

package com.puldroid.recyclerviewselection

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.selection.SelectionTracker
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.item_note.view.*

/**
 * @author aggarwalpulkit596
 */

class NotesAdapter : ListAdapter<NoteModel, NotesAdapter.ItemViewHolder>(DiffCallback()) {


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder {
        return ItemViewHolder(
            LayoutInflater.from(parent.context)
                .inflate(R.layout.item_note, parent, false)
        )
    }

    override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
        holder.bind(getItem(position))
    }

    class ItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bind(item: NoteModel) = with(itemView) {
            noteTitleTv.text = item.contentTitle
            noteDescriptionTv.text = item.text
            noteTimeTv.text = item.createdAt
        }
    }

    class DiffCallback : DiffUtil.ItemCallback<NoteModel>() {
        override fun areItemsTheSame(oldItem: NoteModel, newItem: NoteModel): Boolean {
            return oldItem.nttUid == newItem.nttUid
        }

        override fun areContentsTheSame(oldItem: NoteModel, newItem: NoteModel): Boolean {
            return oldItem == newItem
        }
    }
}