Android RecyclerView Kotlin Example with model class

1/Step:  Create A New Project and add the code activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rlMain"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:orientation="vertical">
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

2/Step :  Add the code MainActivity.kt 

package com.alomkaisa.myapplication

import MoviesAdapter
import android.os.Bundle
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import androidx.recyclerview.widget.DefaultItemAnimator
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {
    private val movieList = ArrayList<MovieModel>()
    private lateinit var moviesAdapter: MoviesAdapter
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        title = "KotlinApp"
        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
        moviesAdapter = MoviesAdapter(movieList)
        val layoutManager = LinearLayoutManager(applicationContext)
        recyclerView.layoutManager = layoutManager
        recyclerView.itemAnimator = DefaultItemAnimator()
        recyclerView.adapter = moviesAdapter
        prepareMovieData()
    }
    private fun prepareMovieData() {
        var movie = MovieModel("Mad Max: Fury Road", "Action & Adventure", "2024")
        movieList.add(movie)
        movie = MovieModel("Inside Out", "Animation, Kids & Family", "2030")
        movieList.add(movie)
        movie = MovieModel("Star Wars: Episode VII - The Force Awakens", "Action", "2023")
        movieList.add(movie)
        movie = MovieModel("Shaun the Sheep", "Animation", "2025")
        movieList.add(movie)
        movie = MovieModel("The Martian", "Science Fiction & Fantasy", "2011")
        movieList.add(movie)
        movie = MovieModel("Mission: Impossible Rogue Nation", "Action", "2015")
        movieList.add(movie)
        movie = MovieModel("Up", "Animation", "2019")
        movieList.add(movie)
        movie = MovieModel("Star Trek", "Science Fiction", "2019")
        movieList.add(movie)
        movie = MovieModel("The LEGO MovieModel", "Animation", "2011")
        movieList.add(movie)
        movie = MovieModel("Iron Man", "Action & Adventure", "2008")
        movieList.add(movie)
        movie = MovieModel("Aliens", "Science Fiction", "1986")
        movieList.add(movie)
        movie = MovieModel("Chicken Run", "Animation", "2000")
        movieList.add(movie)
        movie = MovieModel("Back to the Future", "Science Fiction", "1985")
        movieList.add(movie)
        movie = MovieModel("Raiders of the Lost Ark", "Action & Adventure", "1981")
        movieList.add(movie)
        movie = MovieModel("Goldfinger", "Action & Adventure", "1965")
        movieList.add(movie)
        movie = MovieModel("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014")
        movieList.add(movie)
        movie = MovieModel("Goldfinger", "Action & Adventure", "1965")
        movieList.add(movie)
        movie = MovieModel("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014")
        movieList.add(movie)
        movie = MovieModel("Goldfinger", "Action & Adventure", "1965")
        movieList.add(movie)
        movie = MovieModel("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014")
        movieList.add(movie)
        moviesAdapter.notifyDataSetChanged()
    }
}

3/Step :  Create A New Class MovieModel.kt and add the code.

package com.alomkaisa.myapplication

class MovieModel(title: String?, genre: String?, year: String?) {
    private var title: String
    private var genre: String
    private var year: String
    init {
        this.title = title!!
        this.genre = genre!!
        this.year = year!!
    }
    fun getTitle(): String? {
        return title
    }
    fun setTitle(name: String?) {
        title = name!!
    }
    fun getYear(): String? {
        return year
    }
    fun setYear(year: String?) {
        this.year = year!!
    }
    fun getGenre(): String? {
        return genre
    }
    fun setGenre(genre: String?) {
        this.genre = genre!!
    }
}

4/Step :   Create A New Class MoviesAdapter and add the code .

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.annotation.NonNull
import androidx.recyclerview.widget.RecyclerView
import com.alomkaisa.myapplication.MovieModel
import com.alomkaisa.myapplication.R

internal class MoviesAdapter(private var moviesList: List<MovieModel>) :
    RecyclerView.Adapter<MoviesAdapter.MyViewHolder>() {
    internal inner class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        var title: TextView = view.findViewById(R.id.title)
        var year: TextView = view.findViewById(R.id.year)
        var genre: TextView = view.findViewById(R.id.genre)
    }
    @NonNull
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val itemView = LayoutInflater.from(parent.context)
            .inflate(R.layout.item_row, parent, false)
        return MyViewHolder(itemView)
    }
    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val movie = moviesList[position]
        holder.title.text = movie.getTitle()
        holder.genre.text = movie.getGenre()
        holder.year.text = movie.getYear()
    }
    override fun getItemCount(): Int {
        return moviesList.size
    }
}

5/Step :   Create A New Layout resource file item_row.xml 

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_margin="8dp"
    app:cardBackgroundColor="#120E0E">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="8dp">
        <TextView
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/year"
            android:textColor="@android:color/white"
            android:textSize="20sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/year"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:textColor="@android:color/white" />
        <TextView
            android:id="@+id/genre"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:textColor="@android:color/white" />
    </RelativeLayout>
</androidx.cardview.widget.CardView>

Output :