threaddemo1.java

一本介绍手机游戏开发的书中的源代码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class threadDemo1 extends MIDlet
{
   Display display;
   canvasThread canvasthread;

   public threadDemo1()
   {
      canvasthread=new canvasThread();
      display=Display.getDisplay(this);
   }

   public void startApp()
   {
      display.setCurrent(canvasthread);
   }

   public void pauseApp(){}

   public void destroyApp(boolean unconditional){}

   class canvasThread extends Canvas 
   {
      int  gameaction=0;
      int  view=0;
      goCanvas gocanvas;
      boolean  again;
      Image[]  cloudImage;
      Image[]  sunImage;

      public canvasThread()
      {
        try{
            cloudImage = new Image[]{
                Image.createImage("/cloud-1.png"),
                Image.createImage("/cloud-2.png"),
                Image.createImage("/cloud-3.png"),
                Image.createImage("/cloud-4.png")
            };
            sunImage = new Image[]{
                Image.createImage("/sun-1.png"),
                Image.createImage("/sun-2.png"),
                Image.createImage("/sun-3.png"),
                Image.createImage("/sun-4.png")
            };
        }catch(Exception ex){}
      }
      
      public void keyPressed(int keyCode) 
      {
         gameaction=getGameAction(keyCode);
         switch(gameaction)
         {
            case FIRE:
                 gocanvas=new goCanvas();
                 gocanvas.start();
                 gocanvas=null;
                 break;
         }
      }

      public void paint(Graphics g)
      { 
         g.setColor(0xFFFFFF);
         g.fillRect(0, 0, getWidth(), getHeight());
         g.setColor(0);
         g.drawString("Thread线程动画应用", getWidth()/2, 20, Graphics.HCENTER | Graphics.TOP);
         g.drawImage(sunImage[view], getWidth()/2, 50, Graphics.HCENTER | Graphics.TOP);
         g.drawImage(cloudImage[view], getWidth()/2, 50, Graphics.HCENTER | Graphics.TOP);
      }

      class goCanvas extends Thread
      {
        public void run()
        {
          while(true)
          {
            try{ 
                repaint();
                Thread.sleep(500);
                if(again)
                  view--;
                else
                  view++;
                if(again && view==0)
                  again=false;
                if(!again && view==3)
                  again=true;
            } catch(Exception ex){}
          }
        }
      }
   }
}