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Learning Java by Building Android  Games

You're reading from   Learning Java by Building Android Games Learn Java and Android from scratch by building six exciting games

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Product type Paperback
Published in Aug 2018
Publisher
ISBN-13 9781788839150
Length 774 pages
Edition 2nd Edition
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Author (1):
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John Horton John Horton
Author Profile Icon John Horton
John Horton
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Toc

Table of Contents (28) Chapters Close

Preface 1. Java, Android and Game Development FREE CHAPTER 2. Java: First Contact 3. Variables, Operators and Expressions 4. Structuring Code with Java Methods 5. The Android Canvas Class – Drawing to the Screen 6. Repeating Blocks of Code with Loops 7. Making Decisions with Java If, Else and Switch 8. Object-Oriented Programming 9. The Game Engine, Threads, and The Game Loop 10. Coding the Bat and Ball 11. Collisions, Sound Effects and Supporting Different Versions of Android 12. Handling Lots of Data with Arrays 13. Bitmap Graphics and Measuring Time 14. The Stack, the Heap, and the Garbage Collector 15. Android Localization -Hola! 16. Collections, Generics and Enumerations 17. Manipulating Bitmaps and Coding the Snake class 18. Introduction to Design Patterns and much more! 19. Listening with the Observer Pattern, Multitouch and Building a Particle System 20. More Patterns, a Scrolling Background and Building the Player's ship 21. Completing the Scrolling Shooter Game 22. Exploring More Patterns and Planning the Platformer Project 23. The Singleton Pattern, Java HashMap, Storing Bitmaps Efficiently and Designing Levels 24. Sprite-sheet animations, Controllable Player and Parallax Scrolling Backgrounds 25. Intelligent Platforms and Advanced Collision Detection 26. What next? Index

Entering the nth dimension with Arrays


We very briefly mentioned that an array can even hold other arrays at each position. And of course, if an array holds lots of arrays that in turn hold lots of some other type; how do we access the values in the contained arrays? And why would we ever need this anyway? Look at this next example of where multidimensional arrays can be useful.

Multidimensional Array mini app

Let's make a simple multidimensional array example. You can get the working project for this example in the download bundle. It is in the Chapter 12/Multidimensional Array Example/MainActivity.java.

Create a project with an empty Activity and call it Multidimensional Array Example. Leave the Activity name at the default it is not important.

After the call to super.onCreate… in onCreate, declare and initialize a two-dimensional array like this:

// Random object for generating question numbers
Random randInt = new Random();
// a variable to hold the random value generated
int questionNumber...
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