1)Listview
.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/my_layout"
    tools:context=".MainActivity">
    <ListView
        android:id="@+id/listview"
        android:layout_width="350dp"
        android:layout_height="300dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.491"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.097" />
</androidx.constraintlayout.widget.ConstraintLayout>

.kt
package com.example.listview

import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        var data = arrayOf("RED","GREEN","YELLOW","BLUE","PINK")
        var adp=ArrayAdapter(this,android.R.layout.simple_list_item_1,data)
        listview.adapter=adp
        listview.setOnItemClickListener { adapterView, view, i, l ->
            var d=adapterView.getItemAtPosition(i).toString()
            my_layout.setBackgroundColor(Color.parseColor(d))
        }
    }
}
