Calendar View App in Android with Kotlin

package com.gtappdevelopers.kotlingfgproject

import android.os.Bundle
import android.widget.CalendarView
import android.widget.CalendarView.OnDateChangeListener
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    // on below line we are creating 
    // variables for text view and calendar view
    lateinit var dateTV: TextView
    lateinit var calendarView: CalendarView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
        // initializing variables of 
        // list view with their ids.
        dateTV = findViewById(R.id.idTVDate)
        calendarView = findViewById(R.id.calendarView)
        
        // on below line we are adding set on 
        // date change listener for calendar view.
        calendarView
            .setOnDateChangeListener(
                OnDateChangeListener { view, year, month, dayOfMonth ->
                    // In this Listener we are getting values 
                    // such as year, month and day of month 
                    // on below line we are creating a variable
                    // in which we are adding all the variables in it. 
                    val Date = (dayOfMonth.toString() + "-"
                            + (month + 1) + "-" + year)

                    // set this date in TextView for Display
                    dateTV.setText(Date)
                })

    }
}