Book Image

Kotlin Programming Cookbook

By : Aanand Shekhar Roy, Rashi Karanpuria
Book Image

Kotlin Programming Cookbook

By: Aanand Shekhar Roy, Rashi Karanpuria

Overview of this book

The Android team has announced first-class support for Kotlin 1.1. This acts as an added boost to the language and more and more developers are now looking at Kotlin for their application development. This recipe-based book will be your guide to learning the Kotlin programming language. The recipes in this book build from simple language concepts to more complex applications of the language. After the fundamentals of the language, you will learn how to apply the object-oriented programming features of Kotlin 1.1. Programming with Lambdas will show you how to use the functional power of Kotlin. This book has recipes that will get you started with Android programming with Kotlin 1.1, providing quick solutions to common problems encountered during Android app development. You will also be taken through recipes that will teach you microservice and concurrent programming with Kotlin. Going forward, you will learn to test and secure your applications with Kotlin. Finally, this book supplies recipes that will help you migrate your Java code to Kotlin and will help ensure that it's interoperable with Java.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Showing an alert dialog with a list of text items


In the previous recipe, we saw how to create different types of dialogs. In this recipe, we will see how to create an alert dialog with a list of text items, which looks as illustrated in the following screenshot:

Getting ready

I'll be using Android Studio to write code. You also need to include the Anko library by adding these lines to your build.gradle file:

 compile "org.jetbrains.anko:anko:$anko_version"

How to do it…

Let's go through the given steps to create an alert dialog with a list of items.

Anko provides selectors for creating a dialog with a list of items. Selectors are very easy to use. You just need to provide the title of alert dialog, the list, and the lambda that will be executed when an option is selected. Here's an implementation of it:

val companies = listOf("Google", "Microsoft", "HP", "Apple")
selector("Where do you work?", companies, { dialogInterface, i ->
    toast("So you work at ${companies[i]}, right?")
})

That's all...