J2ME实现图片的运动由按钮控件_j2me 实现按钮-优快云博客

本文链接：https://blog.youkuaiyun.com/as375256234/article/details/6087506

本文介绍了一个简单的Java ME平台上的游戏开发实例，通过继承Canvas类并重写paint方法来绘制图像，并实现了基本的键盘事件响应以控制图像位置的变化。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

//按键的实例

public class Midlet1 extends MIDlet{
private Display dis=Display.getDisplay(this);
private myCanvas mc=new myCanvas();
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

protected void pauseApp() {
// TODO Auto-generated method stub

}

protected void startApp() throws MIDletStateChangeException {
  // TODO Auto-generated method stub
  dis.setCurrent(mc);

}
class myCanvas extends Canvas
{
  private int x=0;
  private int y=0;
  private Image im;
  public myCanvas()
   {
   try{
    im=Image.createImage("/image.gif");//加载图片，图片资源放在res中命名为image.gif
    }catch(Exception e){}

   }

  protected void paint(Graphics arg0) {
   // TODO Auto-generated method stub
   arg0.setColor(255, 255, 255);
   arg0.fillRect(0, 0, this.getWidth(), this.getHeight());
      arg0.drawImage(im, x, y, Graphics.TOP|Graphics.LEFT);

  }
  protected void keyRepeated(int key)
  {
   if(key==Canvas.KEY_NUM2)//按下按钮2向上移动
   {
    y-=5;
   }
   else if(key==Canvas.KEY_NUM8)//按下按键8上移
   {
    y+=5;
   }else if(key==Canvas.KEY_NUM4)//按下按键4向左移动
   {
    x-=5;
   }
   else if(key==Canvas.KEY_NUM6)//按下按键6向右移动
   {
    x+=5;
   }
   this.repaint();
  }

}

}