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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
Languages
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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

Code the GameEngine

Now we get to the class that glues all the others together. In the code that follows we will declare and use an instance of LevelManager that we will code immediately after GameEngine. All the rest of the code will at last be error free and nearly ready to execute.

Add the GameEngine class, its members and constructor as shown next.

import android.content.Context;
import android.graphics.Point;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceView;

import java.util.concurrent.CopyOnWriteArrayList;

class GameEngine extends SurfaceView 
        implements Runnable, 
        GameEngineBroadcaster, 
        EngineController {
    
    private Thread mThread = null;
    private long mFPS;

    private GameState mGameState;
    UIController mUIController;
    
    // This ArrayList can be accessed from either thread
    private CopyOnWriteArrayList<InputObserver> 
            inputObservers = new CopyOnWriteArrayList();
    
    HUD...
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