Book Image

Learning Java by Building Android Games - Second Edition

By : John Horton
Book Image

Learning Java by Building Android Games - Second Edition

By: John Horton

Overview of this book

Android is one of the most popular mobile operating systems presently. It uses the most popular programming language, Java, as the primary language for building apps of all types. However, this book is unlike other Android books in that it doesn’t assume that you already have Java proficiency. This new and expanded second edition of Learning Java by Building Android Games shows you how to start building Android games from scratch. The difficulty level will grow steadily as you explore key Java topics, such as variables, loops, methods, object oriented programming, and design patterns, including code and examples that are written for Java 9 and Android P. At each stage, you will put what you’ve learned into practice by developing a game. You will build games such as Minesweeper, Retro Pong, Bullet Hell, and Classic Snake and Scrolling Shooter games. In the later chapters, you will create a time-trial, open-world platform game. By the end of the book, you will not only have grasped Java and Android but will also have developed six cool games for the Android platform.
Table of Contents (30 chapters)
Learning Java by Building Android Games Second Edition
Contributors
Preface
Index

Coding the Snake class


Add the single import statement and the member variables. Be sure to study the code it will give some insight and understanding to the rest of the Snake class.

import java.util.ArrayList;

class Snake {

    // The location in the grid of all the segments
    private ArrayList<Point> segmentLocations;

    // How big is each segment of the snake?
    private int mSegmentSize;

    // How big is the entire grid
    private Point mMoveRange;

    // Where is the center of the screen
    // horizontally in pixels?
    private int halfWayPoint;

    // For tracking movement Heading
    private enum Heading {
        UP, RIGHT, DOWN, LEFT
    }

    // Start by heading to the right
    private Heading heading = Heading.RIGHT;

    // A bitmap for each direction the head can face
    private Bitmap mBitmapHeadRight;
    private Bitmap mBitmapHeadLeft;
    private Bitmap mBitmapHeadUp;
    private Bitmap mBitmapHeadDown;

    // A bitmap for the body
    private Bitmap...