imageitemdemo.java~10~

J2ME高级用户界面的学习代码

//ImageItemDemo.java

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


public class ImageItemDemo extends MIDlet implements ItemCommandListener, CommandListener
{
  private Display display;
  private Form form;
  private Command cmdExit = new Command("Exit",Command.SCREEN,1);
  private Command cmdImage1 =  new Command("Image1",Command.ITEM,1);
  private Command cmdImage2 =  new Command("Image2",Command.ITEM,1);

  public ImageItemDemo()
  {
    display = Display.getDisplay(this);
    Image img = null;
    try
    {
      img = Image.createImage("/loudspeaker.png");
    }
    catch(Exception e)
    {
      System.out.println("********:" + e.toString());
    }

      form = new Form("ImageItem Demo");
      form.append(img);

      ImageItem Item1 = new ImageItem("Image 1",img,Item.LAYOUT_CENTER | Item.LAYOUT_NEWLINE_BEFORE,"ImageItem 1",Item.BUTTON);
      Item1.setDefaultCommand(cmdImage1);
      Item1.setItemCommandListener(this);
      form.append(Item1);

      ImageItem Item2 = new ImageItem("Image 2",img,Item.LAYOUT_RIGHT|Item.LAYOUT_NEWLINE_BEFORE,"ImageItem2",Item.HYPERLINK);
      Item2.setDefaultCommand(cmdImage2);
      Item2.setItemCommandListener(this);
      form.append(Item2);

      form.addCommand(cmdExit);
      form.setCommandListener(this);



  }

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

  public void commandAction(Command c,Item i)
  {
    System.out.println(c.getLabel());
    System.out.println(i.getLabel());
  }

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

  public void pauseApp(){}
  public void destroyApp(boolean unconditional){}
}