Kotlin Standard Library Cookbook

How to do it...

1. Add a new Activity subclass:

class MainActivity: AppCompatActivity() {}

2. Implement the UI layout in the activity_main.xml file under the src/main/res/layout/ directory:

<?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"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView        android:id="@+id/text_field"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="56sp"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf= ...