threaddemo3.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.*;
import java.util.*;

public class threadDemo3 extends MIDlet
{
   Display display;
   canvasThread canvasthread;

   public threadDemo3()
   {
      canvasthread=new canvasThread();
      display=Display.getDisplay(this);
   }

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

   public void pauseApp(){}

   public void destroyApp(boolean unconditional){}

   public class canvasThread extends Canvas 
   {
      int     gameaction=0;
      int     view=0;
      boolean again;
      Timer   timers;
      Image[] cloudImage;
      Image[] sunImage;

      public canvasThread()
      {
        timers=new Timer(); 
        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:
                 actionView();
                 break;
         }
      }

      public void paint(Graphics g)
      { 
         g.setColor(0xFFFFFF);
         g.fillRect(0, 0, getWidth(), getHeight());
         g.setColor(0);
         g.drawString("Timer磅︽狐笆礶莱ノ", 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);
      }

      private void actionView()
      {
         timers.schedule(new goCanvas(), 500, 500);
      }

      class goCanvas extends TimerTask
      {
        public void run()
        {
           repaint();
           if(again)
              view--;
           else
              view++;
           if(again && view==0)
              again=false;
           if(!again && view==3)
              again=true;
        }
      }
   }
}