The programming language for the first generation of Android app development was Java.

The programming language that will dominate the second generation of Android appdevelopment will be Kotlin.

Kotlin is a powerful language, designed to be concise yet expressive, both forapplication code and for libraries. However, some of that comes at a cost, as Kotlinhas a lot more keywords and specialty features than does Java. A lot of that complexityis only needed by intermediate to advanced Kotlin developers, though.

This introductory book to Kotlin focuses on helping existing programmers get up tospeed on reading and writing Kotlin code. Particular emphasis is placed on the sortsof syntax and language capabilities that most Kotlin developers will need, withlight coverage of the advanced capabilities that allow library developers to createeasy-to-use APIs.

Most of the sample code from the book is available inthe Klassbook,so you can try running it in your Web browser.

This book is published in PDF, EPUB, and MOBI/Kindle formats,for use in your favorite digital book reader. Or, read directly in your Webbrowser. Note that the HTML edition will be taken down at the end of 2025, asthis book will be rather old at that point. However, the downloadable forms(PDF, etc.) will still be available.