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

Building a Fragment Pager/slider app


We can put whole Fragment instances as pages in a PagerAdapter. This is quite powerful because, as we know, a Fragment instance can have a large amount of functionality – even a fully-fledged UI.

To keep the code short and straightforward, we will add a single TextView to each Fragment layout, just to demonstrate that the pager is working. When we see how easy it is to get a reference to the TextView, however, it should be obvious how we could easily add any layout we have learned so far and then let the user interact with it.

Note

In the next project, we will see yet another way to display multiple Fragment instances, NavigationView, and we will actually implement multiple coded Fragment instances.

The first thing we will do is build the content for the slider. In this case, of course, the content is an instance of Fragment. We will build one simple class called SimpleFragment, and one simple layout called fragment_layout.

You might think this implies that...