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Learning Java by Building Android Games - Third Edition

You're reading from  Learning Java by Building Android Games - Third Edition

Product type Book
Published in Mar 2021
Publisher Packt
ISBN-13 9781800565869
Pages 686 pages
Edition 3rd Edition
Languages
Author (1):
John Horton John Horton
Profile icon John Horton

Table of Contents (24) Chapters

Preface 1. Chapter 1: Java, Android, and Game Development 2. Chapter 2: Java – First Contact 3. Chapter 3: Variables, Operators, and Expressions 4. Chapter 4: Structuring Code with Java Methods 5. Chapter 5: The Android Canvas Class – Drawing to the Screen 6. Chapter 6: Repeating Blocks of Code with Loops 7. Chapter 7: Making Decisions with Java If, Else, and Switch 8. Chapter 8: Object-Oriented Programming 9. Chapter 9: The Game Engine, Threads, and the Game Loop 10. Chapter 10: Coding the Bat and Ball 11. Chapter 11: Collisions, Sound Effects, and Supporting Different Versions of Android 12. Chapter 12: Handling Lots of Data with Arrays 13. Chapter 13: Bitmap Graphics and Measuring Time 14. Chapter 14: Java Collections, the Stack, the Heap, and the Garbage Collector 15. Chapter 15: Android Localization – Hola! 16. Chapter 16: Collections and Enumerations 17. Chapter 17: Manipulating Bitmaps and Coding the Snake Class 18. Chapter 18: Introduction to Design Patterns and Much More! 19. Chapter 19: Listening with the Observer Pattern, Multitouch, and Building a Particle System 20. Chapter 20: More Patterns, a Scrolling Background, and Building the Player's Ship 21. Chapter 21: Completing the Scrolling Shooter Game 22. Chapter 22: What Next? 23. Other Books You May Enjoy

Spawning an array of bullets

Now we know the basics of arrays we can get started spawning a load of bullets at the same time and store them in an array.

Tip

Make sure you delete the temporary code from the Spawning a bullet section before proceeding.

Add a few control variables and declare an array of bullets as a member of BulletHellGame. Add this code just before the constructor:

// Up to 10000 bullets
private Bullet[] mBullets = new Bullet[10000];
private int mNumBullets = 0;
private int mSpawnRate = 1;
private Random mRandomX = new Random();
private Random mRandomY = new Random();

Important note

You will need to add the Random class: import java.util.Random;.

We have an array called mBullets, capable of holding 10,000 bullets. The new keyword initializes the array, not the Bullets within the array. We also have two int variables to keep track of how many bullets we want to spawn each time the spawn method is called and how many bullets there are in total.

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