RecycleView Single Choice & Multiple Choice Adapter

item_simple_list.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/selectableItemBackground"
    android:gravity="center_vertical"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:textAppearance="?android:attr/textAppearanceListItemSmall" />

item_simple_list_checkable.xml

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeightSmall"
    android:checkMark="?android:attr/listChoiceIndicatorSingle"
    android:gravity="center_vertical"
    android:background="?attr/selectableItemBackground"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:textAppearance="?android:attr/textAppearanceListItemSmall" />

MultipleChoiceListAdapter.kt

package dev.arpan

import android.util.SparseBooleanArray
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.CheckedTextView
import androidx.recyclerview.widget.RecyclerView
import dev.arpan.ecommerce.R

typealias OnSelectionChange = (positions: List<Int>) -> Unit

class MultipleChoiceListAdapter(private val listener: OnSelectionChange) :
    RecyclerView.Adapter<MultipleChoiceListAdapter.MultipleChoiceItemViewHolder>() {

    private val selections = SparseBooleanArray()
    private val selectedPositions: List<Int>
        get() {
            return mutableListOf<Int>().apply {
                for (i in 0 until selections.size()) {
                    if (selections.valueAt(i)) {
                        add(selections.keyAt(i))
                    }
                }
            }
        }

    var data: List<String> = emptyList()
        set(value) {
            field = value
            notifyDataSetChanged()
        }

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): MultipleChoiceItemViewHolder {
        return MultipleChoiceItemViewHolder.create(parent)
    }

    override fun onBindViewHolder(holder: MultipleChoiceItemViewHolder, position: Int) {
        (holder.itemView as? CheckedTextView)?.apply {
            text = data[position]
            isChecked = selections.get(position)

            setOnClickListener {
                selections.put(position, !isChecked)
                notifyItemChanged(position)

                listener.invoke(selectedPositions)
            }
        }
    }

    override fun getItemCount() = data.size

    class MultipleChoiceItemViewHolder private constructor(private val view: View) :
        RecyclerView.ViewHolder(view) {

        companion object {

            fun create(parent: ViewGroup): MultipleChoiceItemViewHolder {
                return MultipleChoiceItemViewHolder(
                    view = LayoutInflater.from(parent.context)
                        .inflate(
                            R.layout.item_simple_list_checkable,
                            parent, false
                        )
                )
            }
        }
    }

SingleChoiceListAdapter.kt

package dev.arpan

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.CheckedTextView
import android.widget.TextView
import androidx.annotation.LayoutRes
import androidx.recyclerview.widget.RecyclerView
import dev.arpan.ecommerce.R
import kotlin.properties.Delegates

typealias OnSelectItemListener = (position: Int) -> Unit

class SingleChoiceListAdapter(
    private val checkable: Boolean = true,
    private val itemListener: OnSelectItemListener? = null
) :
    RecyclerView.Adapter<SingleChoiceListAdapter.SingleChoiceItemViewHolder>() {

    var data: List<String> = emptyList()
        set(value) {
            field = value
            notifyDataSetChanged()
        }

    var selectedPosition by Delegates.observable(-1) { _, oldPos, newPos ->
        if (newPos in data.indices) {
            notifyItemChanged(oldPos)
            notifyItemChanged(newPos)
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SingleChoiceItemViewHolder {
        return SingleChoiceItemViewHolder.create(
            if (checkable) R.layout.item_simple_list_checkable else R.layout.item_simple_list,
            parent
        )
    }

    override fun onBindViewHolder(holder: SingleChoiceItemViewHolder, position: Int) {
        holder.bind(data[position], position == selectedPosition)
        holder.itemView.setOnClickListener {
            selectedPosition = position
            itemListener?.invoke(position)
        }
    }

    override fun getItemCount() = data.size

    class SingleChoiceItemViewHolder(private val view: View) :
        RecyclerView.ViewHolder(view) {

        fun bind(s: String, selected: Boolean) {
            (view as? TextView)?.apply {
                text = s
                isSelected = selected
            }
            (view as? CheckedTextView)?.apply {
                isChecked = selected
            }
        }

        companion object {
            fun create(@LayoutRes layout: Int, parent: ViewGroup): SingleChoiceItemViewHolder {
                return SingleChoiceItemViewHolder(
                    view = LayoutInflater.from(parent.context).inflate(layout, parent, false)
                )
            }
        }
    }
}