Using the calendar -- j2me 中 Datefield的使用方法

领测软件测试网 前言:Datefield 是j2me中一个显示日历的可视组件,
这篇文章讲的视Datefield 事件触发的处理,通过
itemStateChanged方法实现,推荐给大家

Using the calendar

answered by Eric Giguere, author of Sun''s J2ME Tech Tips
In this example a DateField object is created and added to a form. When you click on the date, you can change it by navigating through the calendar. When the date is changed, a message appears. Example described in the "MIDP Event Handling" article. (EventEx2.java)

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);
    }
}
 

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