java Me中的按键和触屏实例

package com.canvas.image;

import java.io.IOException;

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.lcdui.Image;

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

public class Plane extends MIDlet 

{

   private Display display=null;

   private PlaneCanvas plane=null;

public Plane() 

{

display=Display.getDisplay(this);

plane=new PlaneCanvas(this);

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException 

{

}

protected void pauseApp() 

{

}

protected void startApp() throws MIDletStateChangeException 

{

display.setCurrent(plane);

}

public void close()

{

try 

{

destroyApp(true);

} 

catch(MIDletStateChangeException e)

{

e.printStackTrace();

}