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Android Programming with Kotlin for Beginners

You're reading from  Android Programming with Kotlin for Beginners

Product type Book
Published in Apr 2019
Publisher Packt
ISBN-13 9781789615401
Pages 698 pages
Edition 1st Edition
Languages
Author (1):
John Horton John Horton
Profile icon John Horton

Table of Contents (33) Chapters

Android Programming with Kotlin for Beginners
Contributors
Preface
1. Getting Started with Android and Kotlin 2. Kotlin, XML, and the UI Designer 3. Exploring Android Studio and the Project Structure 4. Getting Started with Layouts and Material Design 5. Beautiful Layouts with CardView and ScrollView 6. The Android Lifecycle 7. Kotlin Variables, Operators, and Expressions 8. Kotlin Decisions and Loops 9. Kotlin Functions 10. Object-Oriented Programming 11. Inheritance in Kotlin 12. Connecting Our Kotlin to the UI and Nullability 13. Bringing Android Widgets to Life 14. Android Dialog Windows 15. Handling Data and Generating Random Numbers 16. Adapters and Recyclers 17. Data Persistence and Sharing 18. Localization 19. Animations and Interpolations 20. Drawing Graphics 21. Threads and Starting the Live Drawing App 22. Particle Systems and Handling Screen Touches 23. Android Sound Effects and the Spinner Widget 24. Design Patterns, Multiple Layouts, and Fragments 25. Advanced UI with Paging and Swiping 26. Advanced UI with Navigation Drawer and Fragment 27. Android Databases 28. A Quick Chat Before You Go Other Book You May Enjoy Index

A random diversion


Sometimes, we will want a random number in our apps and, for these occasions, Kotlin provides us with the Random class. There are many possible uses for this class, such as if our app wants to show a random tip-of-the-day, or a game that has to choose between scenarios, or a quiz that asks random questions.

The Random class is part of the Android API and is fully compatible in our Android apps.

Let's take a look at how to create random numbers. All the hard work is done for us by the Random class. First, we need to create a Random object, as follows:

val randGenerator = Random()

Then, we use our new object's nextInt function to generate a random number between a certain range. The following line of code generates the random number using our randGenerator object and stores the result in the ourRandomNumber variable:

var ourRandomNumber = randGenerator.nextInt(10)

The number that we enter for the range starts from zero. So, the preceding line will generate a random number between...

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