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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

The Soundpool class


The SoundPool class allows us to hold and manipulate a collection of sound FX; literally, a pool of sounds. The class handles everything from decompressing a sound file like a .wav or a .ogg, keeping an identifying reference to it via an integer id and of course, playing the sound. When the sound is played it is done so in a non-blocking manner (using a thread behind the scenes) that does not interfere with the smooth running of our game or our user's interaction with it.

The first thing we need to do is add the sound effects to a folder called assets in the main folder of the game project. We will do this for real shortly.

Next, in our Java code, declare an object of type SoundPool and an int identifier for each and every sound effect we intend to use. We also declare another int called nowPlaying which we can use to track which sound is currently playing and we will see how we do this shortly.

// create an identifier
SoundPool sp;
int nowPlaying =-1;
int idFX1 = -1;
float...
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