event handling-eventex2.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
 * are met:
 *  
 *  * Redistribution of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 * 
 *  * Redistribution in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * 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
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *  
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility. 
 */

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

public class EventEx2 extends MIDlet {
    Display display;

    public EventEx2() {
        display = Display.getDisplay(this);
    }

    public void destroyApp (boolean unconditional) {
        notifyDestroyed();
        System.out.println("App destroyed ");
    }

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

    public void startApp () {
        Form form = new Form("Change Date");
        
        ItemStateListener listener = new ItemStateListener() {
            java.util.Calendar cal = 
              java.util.Calendar.getInstance(java.util.TimeZone.getDefault());

            public void itemStateChanged(Item item) {
                cal.setTime(((DateField)item).getDate());
                System.out.println("\nDate has changed");
            }
        };

        // register for events
        form.setItemStateListener(listener);
        
        // get today's date
        java.util.Date now = new java.util.Date();
        DateField dateItem = new DateField("Today's date:", DateField.DATE);
        dateItem.setDate(now);
        // add date to the Form screen
        form.append(dateItem);
        display.setCurrent(form);
    }
}