android kotlin - Get app version name and code

MainActivity.kt

package com.example.jetpack

import android.content.pm.PackageInfo
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.pm.PackageInfoCompat
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

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

        // get the package info instance
        val packageInfo: PackageInfo = packageManager.getPackageInfo(packageName, 0)
        // get this app version name programmatically
        val versionName: String = packageInfo.versionName
        // get this app version code programmatically
        val versionCode: Long = PackageInfoCompat.getLongVersionCode(packageInfo)

        // display the collected information in text view
        textView.text = "Package Name: $packageName"
        textView.append("\nVersion Name: $versionName")
        textView.append("\nVersion Code : $versionCode")
    }
}

activity_main.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:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E5E4E2"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:fontFamily="sans-serif-condensed"
        android:textColor="#191970"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>