eventex2.java

手机游戏设计一书的源代码

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");

        //这里我们设置的听众是ItemStateListener
        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");
            }
        };

        //为事件注册听众
        form.setItemStateListener(listener);

        // 得到当天的日期
        java.util.Date now = new java.util.Date();
        DateField dateItem = new DateField("Today's date:", DateField.DATE);
        dateItem.setDate(now);
        //将日期加到表单中
        form.append(dateItem);
        display.setCurrent(form);
    }
}