midlet2.java

这是郭克华老师的J2ME视频的源代码

package prj23_1;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
//两个图片相向运动，碰撞之后弹回
public class MIDlet2 extends MIDlet {
	private MyGameCanvas mgc = new MyGameCanvas();
	private Display dis;
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(mgc);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

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

	}
	
	class MyGameCanvas extends GameCanvas implements Runnable{
		private Image img1;
		private Image img2;		
		private Sprite sp1;		
		private Sprite sp2;
		private Graphics gra;
		private int x1 = 0,y1 = 0;
		private int x2 = 200, y2 = 200;
		private boolean RUN = true;
		private boolean DIR = true;
		public MyGameCanvas(){
			super(true);
			try{
				img1 = Image.createImage("/img1.png");
				img2 = Image.createImage("/img2.png");
				sp1 = new Sprite(img1);
				sp2 = new Sprite(img2);
				gra = this.getGraphics();
			}catch(Exception ex){
				ex.printStackTrace();
			}
			sp1.setPosition(x1, y1);
			sp2.setPosition(x2, y2);
			new Thread(this).start();	
		}
		public void run(){
			while(RUN){
				if(DIR){
					sp1.move(1, 1);	//右下移动
					sp2.move(-1, -1);	//左上移动
				}
				else{
					sp2.move(1, 1);
					sp1.move(-1, -1);
				}
				gra.setColor(255,255,255);
				gra.fillRect(0,0,this.getWidth(),this.getHeight());
				sp1.paint(gra);			
				sp2.paint(gra);	
				this.flushGraphics();
				if(sp1.collidesWith(sp2, true)){//碰撞检测
					//RUN = false;
					DIR = false;
				}
				try{
					Thread.currentThread().sleep(10);
				}catch(Exception ex){}
			}
			
		}
	}


}