imageitemdemo.java

《Java ME手机应用开发大全》源码 書籍內容簡介： http://www.china-pub.com/410

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ImageItemDemo extends MIDlet  
                            implements CommandListener
{
  private Display display; 
  private Form form; 
  private Command exit; 
  private Command next;
  private Image[] image;
  private ImageItem imageItem;
  private int i=0; 
  public ImageItemDemo()
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
	next= new Command("Next",Command.ITEM,2);
    form = new Form("汽车标志相册");    
    form.addCommand(exit);
	form.addCommand(next);
    form.setCommandListener(this); 
	
    try 
    { 
      image=new Image[6];
	  for(;i<6;i++)
        {
	      image[i] = Image.createImage("/"+i+".png");
		}
      imageItem = new ImageItem(null, image[0], 
                      ImageItem.LAYOUT_NEWLINE_BEFORE | 
                      ImageItem.LAYOUT_CENTER | 
                      ImageItem.LAYOUT_NEWLINE_AFTER, "My Image");
     form.append(imageItem);  
    }   
    catch (java.io.IOException error)
    {
     Alert alert = new Alert("Error", "不能显示图片", 
                              null, null);
     alert.setTimeout(Alert.FOREVER);
     alert.setType(AlertType.ERROR);
     display.setCurrent(alert);      
    }    
  }
  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==next)
	  {
		System.out.println(i);
		if(i==6)
		i=0;
		imageItem.setImage(image[i]);
		i++;
	  }
  }
}