J2ME游戏开发入门(简单游戏代码)

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J2ME游戏开发入门(简单游戏代码)

	J2ME游戏开发入门(简单游戏代码)
	Author: 一滴蔚蓝色 \| Date: 2008-01-23 \| View: 1641 \| 开发技术 - 新手上路 \| Digg: 1

经常看到许多学习手机游戏开发,对于线程一直不知道该如何控制,下面是我写的一个例子,希望对开发游戏的兄弟有所帮助,有何不妥之处也请指正!

//GameMIDlet.java

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.Display;

public class GameMIDlet extends MIDlet {
 Game game;
 Display display;

 public GameMIDlet() {
 game = new Game(this);
 display = Display.getDisplay(this);
 }

 protected void startApp() throws MIDletStateChangeException {
 game.setGameState(game.LOGO, 30);
 game.start();
 display.setCurrent(game);
 }

 protected void pauseApp() {
 notifyPaused();
 }

 protected void destroyApp(boolean _boolean) throws MIDletStateChangeException {
 notifyDestroyed();
 }
}

// Game.java

import javax.microedition.lcdui.*;
import com.nokia.mid.ui.*;

/**
* 
* Title:
* 
*
* 
* Description:
* 
*
* 
* Copyright: Copyright (c) 2005
* 
*
* 
* Company:
* 
*
* @author not attributable
* @version 1.0
*/
public class Game extends FullCanvas implements Runnable ,CommandListener{

 private GameMIDlet gameMIDlet;

 private boolean runGame;// 游戏是否启动
 private int fps;// 频率
 private int gameState = -1; // 当前游戏状态
 /**
 * 游戏状态参数
 */

 public final byte LOGO = 0;
 public final byte MENU = 1;
 public final byte ABOUT = 2;
 public final byte HELP = 3;
 public final byte WAIT = 4;
 public final byte LOGINFORM = 5;
 public final byte RESULT = 6;
 public final byte LOADING = 7;
 public final byte REGIST = 8;
 public final byte GAME = 9;

 private Image bufferedImage;// 双缓冲图片

 private Form form;
 private Command cmdReg, cmdBack; // 注册、登陆、返回、修改按钮对象
 private TextField tfAccount, tfPassWord; // 昵称、密码，TextField对象
 /**
 * 默认构造方法
 */
 public Game(GameMIDlet midlet) {
 gameMIDlet = midlet;
 int width = 128;
 int height = 128;

// create image buffer:
 bufferedImage = Image.createImage(width, height);
 }

 protected void keyPressed(int keyCode) {
 if (keyCode == -5) {
 setGameState(LOGINFORM, 30);
 }
 }

 /**
 * 设置当前状态
 *
 * @param bGameState
 * byte 状态值
 * @param newFPS
 * byte 当前状态下的频率
 */

 public void setGameState(int bGameState,int newFPS){
 this.release();
 this.gameState = bGameState;
 this.fps = newFPS;
 this.init();
 }
 /**
 * 设置当前状态
 *
 * @param bGameState
 * int 状态值
 */
 public void setGameState(int bGameState){
 this.release();
 this.gameState = bGameState;
 this.fps = 30;
 this.init();
 }
 /**
 * 得到当前状态
 *
 * @return int
 */
 public int getGameState(){
 return this.gameState;
 }

 /**
 * 游戏主线程启动
 */

 public void start() {
 runGame = true;
 Thread t = new Thread(this);
 t.start();
 }

 /**
 * 游戏主线程停止
 */
 public void stop() {
 runGame = false;
 }
 /**
 * 实现Runnable接口
 */
 public void run() {
 Graphics g = bufferedImage.getGraphics();// 得到Graphics绘图对象
 long startTime;
 int interval = 1000 / this.fps;
 byte count = 2;// 垃圾回收次数控制
 byte n = count;
 Thread currentThread = Thread.currentThread();
 while (runGame && currentThread == Thread.currentThread()) {
 interval = 1000 / this.fps;
 startTime = System.currentTimeMillis();

 this.input();

 this.work();

 drawScreen(g);
 if (gameState != LOGINFORM) {
 repaint();// 请求刷新屏幕
 serviceRepaints();
 }

 waitSomething(startTime, interval);
 if (n == 0) {
 Runtime.getRuntime().gc();
 n = count;
 }
 n--;
 }
 }
 /**
 * 线程休眠一段时间
 *
 * @param loopStartTime
 * long
 * @param interval
 * long
 */
 protected void waitSomething(long loopStartTime, long interval) {
 long time = System.currentTimeMillis() - loopStartTime;
 if (time < interval) {
 try {
 Thread.sleep(interval - time);
 } catch (InterruptedException e) {}
 } else {
 Thread.yield();
 }
 }

 public void paint(Graphics g) {
 g.drawImage(this.bufferedImage, 0, 0, Graphics.TOP | Graphics.LEFT);
 }
 /**
 * 当前状态初始化
 */
 protected void init() {
 switch (getGameState()) {
 case LOGINFORM:
 initLoginForm();
 break;
 default:
 break;
 }
 }

 /**
 * 当前状态释放资源
 */
 protected void release() {
 switch (getGameState()) {
 case LOGINFORM:
 releaseLoginForm();
 break;
 default:
 break;
 }
 Runtime.getRuntime().gc();
 }
 /**
 * 当前状态下的用户输入
 */
 protected void input() {
 }
 /**
 * 当前状态下的逻辑处理
 */
 protected void work() {
 }
 /**
 * 当前状态下的绘制
 *
 * @param g
 * Graphics
 */
 protected void drawScreen(Graphics g) {
 switch (getGameState()) {
 case LOG
 g.drawString("aaa",10,50,0);
 break;
 default:
 break;
 }
 System.out.println(Runtime.getRuntime().freeMemory());
 }

 private void initLoginForm(){
 form = new Form("用户登陆");
 tfAccount = new TextField("帐号:", "", 9, TextField.ANY);
// tfPassWord = new TextField("密码:", "", 9, TextField.PASSWORD);

 cmdReg = new Command("注册", Command.SCREEN, 2);
 cmdBack = new Command("后退", Command.BACK, 3);

 form.append(tfAccount);
// form.append(tfPassWord);

 form.addCommand(cmdReg);
 form.addCommand(cmdBack);

 form.setCommandListener(this);
 gameMIDlet.display.setCurrent(form);
 }

 public void commandAction(Command command, Displayable displayable) {
 if (command == cmdReg) {
 setGameState(LOGO, 30);
 gameMIDlet.display.setCurrent(this);
 }
 }

 private void releaseLoginForm(){
 for (int i = form.size() - 1; i >= 0; i --){
 form.delete(i);
 }
 tfAccount = null;
// tfPassWord = null;
 cmdBack = null;
 cmdReg = null;
 form = null;
 }
}

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