Java手机游戏开发实训 (手机上下左右键设置代码)

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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 = "*号键"; break; case 35:

direction = "#键"; break; }

repaint();//重绘组件 } }

两个文件放在一个文件夹下，文件夹名为 KeyCode.java 生成 启动

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