event handling-eventex2.java

来自「RMS移动商务应用开发」· Java 代码 · 共 82 行

/* 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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 * 
 * 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
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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);
    }
}