Book Image

Mastering Android Development with Kotlin

By : Miloš Vasić
Book Image

Mastering Android Development with Kotlin

By: Miloš Vasić

Overview of this book

Kotlin is a programming language intended to be a better Java, and it's designed to be usable and readable across large teams with different levels of knowledge. As a language, it helps developers build amazing Android applications in an easy and effective way. This book begins by giving you a strong grasp of Kotlin's features in the context of Android development and its APIs. Moving on, you'll take steps towards building stunning applications for Android. The book will show you how to set up the environment, and the difficulty level will grow steadily with the applications covered in the upcoming chapters. Later on, the book will introduce you to the Android Studio IDE, which plays an integral role in Android development. We'll use Kotlin's basic programming concepts such as functions, lambdas, properties, object-oriented code, safety aspects, type parameterization, testing, and concurrency, which will guide you through writing Kotlin code in production. We'll also show you how to integrate Kotlin into any existing Android project.
Table of Contents (24 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Refactoring and cleanup


To have the best possible code after conversion, we must perform refactoring and cleanup. We will adapt our code base to conform Kotlin standards and idioms. For that purpose, you must read it whole. Only when this is done, we can consider our migration done!

Open your classes and read the code. There is a lot of space for improvements! After you do some work, you should get something like this:

The MigrationActivity code is as follows:

    ... 
    override fun onResume() = super.onResume() 
    ... 

As you can see, there is not too much work for MigrationActivity (and MigrationActivity2). Both classes are really small. A bigger effort is expected for classes such as Dummy and Dummy2:

  • The Dummy class code is as follows:
        package com.journaler.model 
 
        class Dummy( 
          var title: String, 
          var content: String 
          ) { 
 
            constructor(title: String) : this(title, "") { 
            this.title = title 
           } 
 
     ...