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Android Programming with Kotlin for Beginners

Android Programming with Kotlin for Beginners

By : John Horton
3.7 (19)
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Android Programming with Kotlin for Beginners

Android Programming with Kotlin for Beginners

3.7 (19)
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 (31 chapters)
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30
Index

Device detection mini app

The best way to learn about detecting and responding to devices and their varying attributes (screens, orientations, and so on) is to make a simple app. Let's do this by going through the following steps:

  1. Create a new Empty Activity project and call it Device Detection. Leave all the other settings as their defaults.
  2. Open the activity_main.xml file in the Design tab and delete the default Hello world! TextView.
  3. Drag a Button to the top of the screen and set its onClick property to detectDevice. We will code this function in a minute.
  4. Drag two TextView widgets onto the layout, one below the other, and set their id properties to txtOrientation and txtResolution, respectively.
  5. Check that you have a layout that looks something like the following screenshot:

    Tip

    I have stretched my widgets (mainly horizontally) and increased the textSize attributes to 24sp to make them clearer on the screen, but this is not required for the app to work correctly.

    Device detection mini app
  6. Click the Infer Constraints...

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