This is what libraries in Android Studio are for. They simply extend the capabilities of Java/Kotlin/the Android SDK by letting you use classes and methods built by other users.

This post is an introduction to Kotlin for Android development. Learn how the language differs from Java and the basic syntax and layout.

With IntelliJ and Android Studio, your Kotlin code can be refactored, searched, navigated, and auto-completed. These Integrated Development Environments (IDEs) also support debugging, unit testing, ...

Shortly after detailing new guidance to bind Swift libraries in Xamarin-based iOS mobile development, Microsoft has published similar documentation for binding Kotlin libraries in Android projects.

If you want to learn the Kotlin programming language, check out this list of books, courses, tutorials, videos and websites.