Android RecyclerView Kotlin Example

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

2/Step :  Create A New Layout Item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:textSize="16sp"
    android:textColor="@android:color/black" />

3/Step :   Create A New Class SimpleAdapter

package com.example.recyclerviewsimple

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class SimpleAdapter(private val data: List<String>) : RecyclerView.Adapter<SimpleAdapter.ViewHolder>() {


    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val textView: TextView = itemView as TextView
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {

        val view = LayoutInflater.from(parent.context).inflate(android.R.layout.simple_list_item_1, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {

        holder.textView.text = data[position]
    }

    override fun getItemCount(): Int = data.size
}

4/Step :  MainActivity add the code

package com.example.recyclerviewsimple

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.alomkaisa.myapplication.R

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)


        recyclerView.layoutManager = LinearLayoutManager(this)

        val data = listOf("Item 1", "Item 2", "Item 3", "Item 4", "Item 5")

        recyclerView.adapter = SimpleAdapter(data)
    }
}