Book Image

Android Programming with Kotlin for Beginners

By : John Horton
5 (1)
Book Image

Android Programming with Kotlin for Beginners

5 (1)
By: John Horton

Overview of this book

Android is the most popular mobile operating system in the world and Kotlin has been declared by Google as a first-class programming language to build Android apps. With the imminent arrival of the most anticipated Android update, Android 10 (Q), this book gets you started building apps compatible with the latest version of Android. It adopts a project-style approach, where we focus on teaching the fundamentals of Android app development and the essentials of Kotlin by building three real-world apps and more than a dozen mini-apps. The book begins by giving you a strong grasp of how Kotlin and Android work together before gradually moving onto exploring the various Android APIs for building stunning apps for Android with ease. You will learn to make your apps more presentable using different layouts. You will dive deep into Kotlin programming concepts such as variables, functions, data structures, Object-Oriented code, and how to connect your Kotlin code to the UI. You will learn to add multilingual text so that your app is accessible to millions of more potential users. You will learn how animation, graphics, and sound effects work and are implemented in your Android app. By the end of the book, you will have sound knowledge about significant Kotlin programming concepts and start building your own fully featured Android apps.
Table of Contents (33 chapters)
Android Programming with Kotlin for Beginners
Contributors
Preface
Index

Implementing the game loop with a thread


Now that we have learned about the game loop and threads, we can put it all together to implement our game loop in the Living Drawing project.

We will add the entire code for the game loop, including writing code in two functions in the MainActivity class to start and stop the thread that will control the loop.

Note

Reader challenge

Can you work out for yourself how the Activity-based class will start and stop the thread in the LiveDrawingView class?

Implementing Runnable and providing the run function

Update the class declaration by implementing Runnable, as shown in the following highlighted code:

class LiveDrawingView(
        context: Context,
        screenX: Int)
    : SurfaceView(context), Runnable {

Notice that we have a new error in the code. Hover the mouse cursor over the word Runnable, and you will see a message informing you that we need to implement the run function just as we discussed during the discussion on interfaces and threads in the...