Use ItemStateListener : ItemStateListener « J2ME « Java Tutorial






  1. Java Tutorial
  2. J2ME
  3. ItemStateListener
Use ItemStateListener
/* 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.
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 *      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
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import javax.microedition.lcdui.DateField;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.midlet.MIDlet;

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);
  }
}








31.13.ItemStateListener
31.13.1.Use ItemStateListenerUse ItemStateListener