keymidlet.java

J2ME部分源代码

/*
 * KeyMidlet.java
 *
 * Created on 2008年9月9日, 下午6:18
 */

package com.j2medev.sample.chapter3.keyrepeat;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 *
 * @author  yqsun
 * @version
 */
public class KeyMidlet extends MIDlet implements CommandListener{
    
    private Display display;
    private KeyCanvas mainCanvas;
    private Command exitCommand = new Command("退出",Command.EXIT,1);
    
    public void startApp() {
        if(display==null)
            display = Display.getDisplay(this);
        mainCanvas = new KeyCanvas();
        mainCanvas.addCommand(exitCommand);
        mainCanvas.setCommandListener(this);
        
        //start Thread
        new Thread(mainCanvas).start();
        display.setCurrent(mainCanvas);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command cmd, Displayable displayable){
        if(cmd==exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }
    }
}

class KeyCanvas extends Canvas implements Runnable{
    
    private boolean leftPressed;
    private boolean rightPressed;
    private boolean stop = false;
    
    public synchronized void keyPressed(int keyCode){
        int action = getGameAction(keyCode);
        switch(action){
            case LEFT:
                //left();
                leftPressed = true;
                break;
            case RIGHT:
                //right();
                rightPressed = true;
                break;
            default:
                break;
        }
        repaint();
    }  
    
    public void run(){
        while(!stop){
            if(leftPressed){
                //left();
            }
            if(rightPressed){
                //right();
            }
            try{
                Thread.sleep(50);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
    
    public void showNotify(){
        System.out.println(this.hasPointerEvents());
        if(!isShown())
            System.out.println("showNotify()在Canvas显示之前被调用");
    }
    
    public void hideNotify(){
        System.out.println(this.hasPointerEvents());
        if(!isShown())
            System.out.println("hideNotify在Canvas被删除之后被调用");
        stop = true;
    }
    
    protected void paint(Graphics g){
        
    }

}