Java Tutorial/J2ME/ItemStateListener

Use ItemStateListener

/* License
 * 
 * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * without specific prior written permission.
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 * This software is provided "AS IS," without a warranty of any kind. ALL
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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);
  }
}