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

Using Butterknife with Kotlin


The Android world has many libraries that require annotation processing. You just annotate the code, and it generates all the code behind the scenes for you, making your life easier. Many libraries such as Butterknife and Dagger2 work in similar ways. In this recipe, we will learn how to use Butterknife with Kotlin. For those who aren't familiar with Butterknife, it's a library that binds a view to a field without needing the findViewById calls. It's a household name in the Android development world. In Kotlin, the Kotlin Android Extension does almost the same work and is bundled along with Kotlin. However, if you are migrating your Java code where you've used Butterknife, this recipe will help you.

Getting ready

We will be using Android Studio 3.0 for coding purposes.

How to do it…

To include Butterknife in your project, follow the given steps:

  1.  To start with, add the following lines to your build.gradle file; also, you need to add the kotlin-kapt plugin and replace...