popupbuttons.java

Java ME手机应用开发大全一书的配套光盘上的源码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class PopupButtons extends MIDlet implements CommandListener
{
  private Display display;
  private Form form; 
  private Command exit; 
  private Command process; 
  private ChoiceGroup item; 
  private int currentIndex; 
  private int genderIndex; 
  private Image img1,img2,img3;
  public PopupButtons()
  {
    try
    {
    img1=Image.createImage("/1.png");
	img2=Image.createImage("/2.png");
	img3=Image.createImage("/3.png");
    }
    catch (Exception e)
    {
    }
	display = Display.getDisplay(this);
    item = new ChoiceGroup("Popup", Choice.POPUP);
    item.append("Option1", img1);
	item.append("Option2", img2);
    currentIndex = item.append("Option3", img3);
    item.setSelectedIndex(currentIndex, true);
    exit = new Command("退出", Command.EXIT, 1);
    process = new Command("提交", Command.SCREEN,2);
    form = new Form("");
    genderIndex = form.append(item);
    form.addCommand(exit);
    form.addCommand(process);
    form.setCommandListener(this);   
  }
  public void startApp()
  {
    display.setCurrent(form);
  }
  public void pauseApp()
  { 
  }
  public void destroyApp(boolean unconditional)
  { 
  }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == exit)
    {
          destroyApp(false);
          notifyDestroyed();
    }
    else if (command == process)
    {
      currentIndex = item.getSelectedIndex();
      StringItem message = new StringItem("选择的选项是", item.getString(currentIndex));
      form.append(message);      
      form.delete(genderIndex);
      form.removeCommand(process);
    }
  }
}