event handling-eventex3.java

RMS移动商务应用开发

/* License
 * 
 * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *      this list of conditions and the following disclaimer.
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 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *  
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;


public class EventEx3 extends MIDlet {
    Display display;
    Command exit;


    public EventEx3() {
        display = Display.getDisplay(this);
    }

    public void destroyApp (boolean unconditional) {
    }

    public void pauseApp () {
        System.out.println("App paused.");
    }

    public void startApp () {
       display = Display.getDisplay(this);

       Canvas canvas = new Canvas() { // anonymous class     

         public void paint(Graphics g) {
         }

         protected void keyPressed(int keyCode) {
           if (keyCode > 0) {
             System.out.println("keyPressed " +((char)keyCode));
           } else {
             System.out.println("keyPressed action " +getGameAction(keyCode));
           }                  
         }

         protected void keyReleased(int keyCode) {
           if (keyCode > 0) {
             System.out.println("keyReleased " +((char)keyCode));
           } else {
             System.out.println("keyReleased action " +getGameAction(keyCode));
           } 
         }
      }; // end of anonymous class

      exit = new Command("Exit", Command.STOP, 1);
      canvas.addCommand(exit);
      canvas.setCommandListener(new CommandListener() {
        public void commandAction(Command c, Displayable d) {
          if(c == exit) {
            notifyDestroyed();
          } else {
            System.out.println("Saw the command: "+c);
          }
        }
      });
      display.setCurrent(canvas);
    }
}