Generic Recycler View Adapter

GenericRecyclerViewAdapter.kt

package com.malwinder.kotlindemo.recyclerview

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.annotation.LayoutRes
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView

class Adapter<T>(
    @LayoutRes private val layoutId: Int,
    private val setData: (position: Int, dataItem: T, itemView: View) -> Unit
) :
    ListAdapter<T, Adapter<T>.ViewHolder<T>>(object : DiffUtil.ItemCallback<T>() {

        override fun areItemsTheSame(oldItem: T, newItem: T) =
            oldItem.hashCode() == newItem.hashCode()

        override fun areContentsTheSame(oldItem: T, newItem: T) = areItemsTheSame(oldItem, newItem)
    }) {

    inner class ViewHolder<T>(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun setData(position: Int) {
            setData(position, getItem(position), itemView)
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
        ViewHolder<T>(LayoutInflater.from(parent.context).inflate(layoutId, parent, false))

    override fun onBindViewHolder(holder: ViewHolder<T>, position: Int) = holder.setData(position)
}

/**
 * Shows data on [RecyclerView] by setting adapter
 */
inline fun <reified T> RecyclerView.showData(
    dataList: List<T?>? = null,
    @LayoutRes layoutId: Int,
    noinline setData: (position: Int, dataItem: T, itemView: View) -> Unit
) {
    layoutManager = LinearLayoutManager(context)
    adapter = Adapter(layoutId, setData).apply {
        submitList(dataList)
    }
}

/**
 * Used for updating data to already added Adapter
 */
inline fun <reified T> RecyclerView.updateData(
    dataList: List<T?>? = null
) {
    @Suppress("UNCHECKED_CAST")
    (adapter as Adapter<T>).submitList(dataList)
}

/**
 * Refresh the data by calling notifyDataSetChanged
 */
fun RecyclerView.refresh() {
    (adapter as Adapter<*>).notifyDataSetChanged()
}