datefielddemo.java

J2ME高级用户界面的学习代码

//DateFieldDemo.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;

public class DateFieldDemo extends MIDlet implements CommandListener
{
  private Display display;
  private Form form;
  private Command cmdExit;
  private DateField dateField;

  public DateFieldDemo()
  {
    display = Display.getDisplay(this);
    cmdExit = new Command("Exit",Command.SCREEN,1);
    dateField = new DateField("My Calendar",DateField.DATE_TIME);
    dateField.setDate(new Date());
    form =  new Form("Test DateField");
    form.append(dateField);
    form.addCommand(cmdExit);
    form.setCommandListener(this);

    ItemStateListener listener = new ItemStateListener()
    {
      Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
      public void itemStateChanged(Item item)
      {
        calendar.setTime(((DateField)item).getDate());
        System.out.println("Date has changed!");
      }
    };
    form.setItemStateListener(listener);
  }

  public void startApp()
  {
    display.setCurrent(form);
  }

  public void pauseApp(){}
  public void destroyApp(boolean unconditional){}
  public void commandAction(Command c,Displayable d)
  {
    if(cmdExit == c)
    {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}