Skip to Main Content
Android Programming with Kotlin for Beginners
book

Android Programming with Kotlin for Beginners

by John Horton
April 2019
Beginner to intermediate content levelBeginner to intermediate
698 pages
15h 15m
English
Packt Publishing
Content preview from Android Programming with Kotlin for Beginners

Lambdas

When a RadioButton widget is part of RadioGroup, the visual appearance of them is coordinated for us. All we need to do is react when any given RadioButton widget is pressed. Of course, as with any other button, we need to know when they have been clicked on.

A RadioButton widget behaves differently to a regular Button widget and simply listening for clicks in onClick (after implementing OnClickListener) will not work because the RadioButton class is not designed that way.

What we need to do is use another Kotlin feature. We need an instance of a special interface, for the sole purpose of listening for clicks on RadioGroup. The next block of code assumes that we have a reference to a RadioGroup instance called radioGroup; here is the code ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Programming Android with Kotlin

Programming Android with Kotlin

Pierre-Olivier Laurence, Amanda Hinchman-Dominguez, Mike Dunn, G. Blake Meike
How to Build Android Apps with Kotlin - Second Edition

How to Build Android Apps with Kotlin - Second Edition

Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal
Java to Kotlin

Java to Kotlin

Duncan McGregor, Nat Pryce

Publisher Resources

ISBN: 9781789615401Supplemental Content