Java手机游戏开发实训 (手机上下左右键设置代码).docx

KeyCode.java（第一个文件）import javax.microedition.midlet.*;import javax.microedition.lcdui.*;/import MyCanvas.java;public class KeyCode extends MIDlet private Display display; private MyCanvas canvas; /定义canvas属性，引用的是用户自定义类 /MyCanvas canvas = new canvas(); public KeyCode() display = Display.getDisplay(this); canvas = new MyCanvas(this);/实例化canvas protected void startApp() display.setCurrent(canvas);/当程序启动时将canvas注册到程序中 protected void pauseApp() protected void destroyApp( boolean unconditional ) public void exitMIDlet()/退出方法 destroyApp(true); notifyDestroyed(); MyCanvas.java（第二个文件）import javax.microedition.midlet.*;import javax.microedition.lcdui.*;public class MyCanvas extends Canvas implements CommandListener private Command exit; private String direction;/定义String型方向变量 private KeyCode keyCodeExample; public MyCanvas (KeyCode keyCodeExample) direction = 2=up 8=dn 4=lt 6=rt; this.keyCodeExample = keyCodeExample; exit = new Command(Exit, Command.EXIT, 1);/定义退出命令对象 addCommand(exit); setCommandListener(this); protected void paint(Graphics graphics)/定义绘画方法 graphics.setColor(255,255,255);/设置颜色为红色 graphics.fillRect(0, 0, getWidth(), getHeight();/填充的起始点为（0,0） graphics.setColor(255, 0, 0); graphics.drawString(direction, 0, 0, Graphics.TOP | Graphics.LEFT); /开始绘画 public void commandAction(Command command, Displayable displayable) keyCodeExample.exitMIDlet(); /定义退出事件 protected void keyPressed(int key)/定义按键 switch ( key ) case KEY_NUM2: direction = up; break; case KEY_NUM8: direction = down; break; case KEY_NUM4: direction = left; break; case KEY_NUM6: direction = right; break; case -1: direction = 上键; break; case -2: direction = 下键; break; case -3: direction = 左键; break; case -4: direction = 右键; break; case -5: direction = 确定; break; case -10: direction = 拨号键; break; case 42: direction = *号