Android RecyclerView in Kotlin :

 

Recyclerview kotlin example :

Step-1;Create Activity Main.Xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:itemCount="5"
        tools:listitem="@layout/card_view_design" />

</LinearLayout>

Step-2:Create Model Class :
data class ItemsViewModel(val image: Int, val text: String){

}
Step-3:Create Adapter  :
package com.like.examplekotlin
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class CustomAdapter(private val mList: List<ItemsViewModel>) 
    : RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    // create new views
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        // inflates the card_view_design view that is used to hold list item
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.card_view_design, parent, false)

        return ViewHolder(view)
    }

    // binds the list items to a view
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {

        val ItemsViewModel = mList[position]

        // sets the image to the imageview from our itemHolder class
        holder.imageView.setImageResource(ItemsViewModel.image)

        // sets the text to the textview from our itemHolder class
        holder.textView.text = ItemsViewModel.text

    }

    // return the number of the items in the list
    override fun getItemCount(): Int {
        return mList.size
    }

    // Holds the views for adding it to image and text
    class ViewHolder(ItemView: View) : RecyclerView.ViewHolder(ItemView) {
        val imageView: ImageView = itemView.findViewById(R.id.imageview)
        val textView: TextView = itemView.findViewById(R.id.textView)
    }
}
Step-4:Create MainActivity.kt :
package com.like.examplekotlin

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import android.widget.Toast.LENGTH_LONG
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // getting the recyclerview by its id
        val recyclerview = findViewById<RecyclerView>(R.id.recyclerview)

        // this creates a vertical layout Manager
        recyclerview.layoutManager = LinearLayoutManager(this)

        // ArrayList of class ItemsViewModel
        val data = ArrayList<ItemsViewModel>()

   
        data.add(ItemsViewModel(R.drawable.raj,"First Items"))
        data.add(ItemsViewModel(R.drawable.raj,"second Items"))
        data.add(ItemsViewModel(R.drawable.raj,"third Items"))
        data.add(ItemsViewModel(R.drawable.raj,"fourth Items"))
        data.add(ItemsViewModel(R.drawable.raj,"Fifth Items"))
        data.add(ItemsViewModel(R.drawable.raj,"six Items"))
        //if we don't want put manually data on recyclerview we use for loop also:
        // This loop will create 20 Views containing
        // the image with the count of view
       /* for (i in 1..20) {
            data.add(ItemsViewModel(R.drawable.raj, "Item " + i))
        }*/

        // This will pass the ArrayList to our Adapter
        val adapter = CustomAdapter(data)

        // Setting the Adapter with the recyclerview
        recyclerview.adapter = adapter

    }
    }
 step-4 :dependencies :
dependencies{
    // for adding recyclerview
    implementation 'androidx.recyclerview:recyclerview:1.2.0'

    // for adding cardview
    implementation 'androidx.cardview:cardview:1.0.0'
}