Finding your way through a Kotlin tutorial is easier ... All this code does, is to tell Android to display the layout file: activity_main.xml. Android Studio has handily opened that for us too ...

Then came Kotlin for ... a built-in feature of Android Studio and an official language for Android for even longer than that. Today, Android tutorials typically provide examples in both Java ...

Kotlin is a super new programming language built by JetBrains, which also coincidentally develops the JetBrains IDE that Android Studio — Google’s official developer tool — is based on.