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

Summary


In this chapter, we made good progress with learning about functions. Although functions have been lurking in our code since the first chapter, we finally got to study and understand them formally. We learned about the different parts of a function: the name, the parameters, and the return type. We have seen that what the function actually does goes inside the opening and closing curly brackets, and is called the function body.

We also saw that we can return from a function at any time by using the return keyword, and that we can also use the return type in conjunction with the return keyword to make data from the function available to the code that called the function in the first place.

We learned how we can use default and named arguments to provide different versions of the same function without writing multiple functions. This makes our code more succinct and manageable.

We also discovered that there is even more to functions than we covered in this chapter, but that it is best...