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

Setting theme for Android views in Anko


Our Android apps won't be so beautiful if we won't be able to style our views. Anko layouts give us the power to apply custom themes to our views. In this recipe, we will learn how to create themed views in Anko.

Getting ready

I'll be using Android Studio 3 to write code. You can get started by creating a new project in Kotlin with a blank activity in Android Studio 3+, as we won't be using any code from other recipes. You also need an intermediate understanding of Android development. Ensure that you have added Anko layouts dependencies to your project (follow the recipe Setting up Anko library for Anko layouts in gradle, in this chapter).

How to do it…

In the given steps, we will learn how to set the theme for Android views using Anko:

  1. Let's start by first creating a style for a button. Custom styles are created in styles.xml inside the res/values/ directory. Let's create a button style and name it newButton. Add the following code in styles.xml:
<style...