java Me中的按键和触屏接口的处理示例

package com.canvas;

import javax.microedition.lcdui.Canvas;

import javax.microedition.lcdui.Command;

import javax.microedition.lcdui.CommandListener;

import javax.microedition.lcdui.Display;

import javax.microedition.lcdui.Displayable;

import javax.microedition.lcdui.Graphics;

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

public class KeyCanvas extends MIDlet 

{

private keyPanel cns=null;

private Display display=null;

public KeyCanvas()

{

cns=new keyPanel(this);

display=Display.getDisplay(this);

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

}

protected void pauseApp() {

}

protected void startApp() throws MIDletStateChangeException {

display.setCurrent(cns);

}

public void close()

{

try

{

destroyApp(true);

}

catch (MIDletStateChangeException e)

{

e.printStackTrace();

}

notifyDestroyed();

}

}

class keyPanel extends Canvas implements CommandListener

{

String key="请按下一个键";