midlet6.java

这是郭克华老师的J2ME视频的源代码

package prj24_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.LayerManager;
import javax.microedition.lcdui.game.TiledLayer;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet6 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 map;
		private TiledLayer tlRoad;
		private TiledLayer tlWall;
		
		private Graphics gra;
		private LayerManager lm;//图层管理器
		private boolean RUN = true;
		private int Y = 0;
		public MyGameCanvas(){
			super(true);
			try{
				map = Image.createImage("/map.png");
				gra = this.getGraphics();
				tlRoad = new TiledLayer(4,4,map,map.getWidth()/2,map.getHeight());
				tlWall = new TiledLayer(4,4,map,map.getWidth()/2,map.getHeight());	
				
				lm = new LayerManager();
				lm.append(tlRoad);
				lm.append(tlWall);
				
				
				int[][] cells = new int[][]{
						{1,2,1,2},
						{1,2,2,2},
						{1,2,1,2},
						{1,2,1,2}
					};
				for(int i=0;i<4;i++){
					for(int j=0;j<4;j++){
						if(cells[j][i]==1){
							tlRoad.setCell(j, i, cells[i][j]);
						}
						else{
							tlWall.setCell(j, i, cells[i][j]);
						}
					}
				}
			}catch(Exception ex){
				ex.printStackTrace();
			}
			new Thread(this).start();
			
		}
		public void run(){
			while(RUN){
				gra.setColor(255,255,255);
				gra.fillRect(0,0,this.getWidth(),this.getHeight());
				//通过LayerManager显示
				lm.setViewWindow(0,Y,80,30);	
				lm.paint(gra, 30,25);	//将图层管理器内的图层画到界面的左上角30,25位置
				this.flushGraphics();
				Y++;
				try{
					Thread.currentThread().sleep(100);
				}catch(Exception ex){}
			}
		}
	}

}