精华在于按钮事件机制

一个是长按一个是按下,另外值得一题的是除了0-9的数字键外都认为是游戏见

keyCode需要用getGameAction()转换一下在进行判断

import java.io.IOException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class MIDlet1 extends MIDlet
{
	private Display dis;
	private Mycanvas mc =new Mycanvas();



	protected void startApp() throws MIDletStateChangeException
	{
		dis=Display.getDisplay(this);
		dis.setCurrent(mc);
	}
	
	class Mycanvas extends Canvas
	{
		private Image img;
		int x,y,dir=Sprite.TRANS_NONE;;
		
		protected Mycanvas()
		{
			x=0;y=0;
			try
			{
				img=Image.createImage("/img.gif");
			} catch (IOException e)
			{
				e.printStackTrace();
			}
		}
		
		protected void paint(Graphics g)
		{
			g.setColor(255, 255, 255);
			g.fillRect(0, 0, this.getWidth(), this.getHeight());
			g.drawRegion(img, 0, 0, img.getWidth(), img.getHeight(), dir, x, y, Graphics.LEFT|Graphics.TOP);
		}
		
		protected void keyRepeated(int keyCode)
		{
			int action;
			action=this.getGameAction(keyCode);
			switch(action)
			{
				case Canvas.UP:   y-=5;break;
				case Canvas.DOWN:   y+=5;break;
				case Canvas.LEFT:   x-=5;break;
				case Canvas.RIGHT:   x+=5;break;
			}
			this.repaint();
		}
		
		protected void keyPressed(int keyCode)
		{
			int action;
			action=this.getGameAction(keyCode);
			if(action==Canvas.FIRE)
			{
				switch(dir)
				{
					case Sprite.TRANS_NONE: dir=Sprite.TRANS_MIRROR_ROT270; break;
					case Sprite.TRANS_MIRROR_ROT90: dir=Sprite.TRANS_MIRROR_ROT180; break;
					case Sprite.TRANS_MIRROR_ROT180: dir=Sprite.TRANS_MIRROR_ROT270; break;
					case Sprite.TRANS_MIRROR_ROT270: dir=Sprite.TRANS_NONE; break;
				}
				this.repaint();
			}
		}
	}
	
	protected void destroyApp(boolean unconditional)
			throws MIDletStateChangeException
	{

	}

	protected void pauseApp()
	{

	}

}