stringitemdemo.java

图书中的经典例子 好好看看 会有帮助的。java2me版本的

//stringItemDemo.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import itemex.*; //引入新创建的类 Button ，HyperLink

public class stringItemDemo extends MIDlet implements CommandListener, ItemCommandListener
{
    private Command exitCommand;
    StringItem strTitle;
    Button btn
;
    HyperLink hlink1, hlink2, hlink3;
    Form form;
    Font font;

    public stringItemDemo()
    {
        //创建Form对象并设置命令
        form = new Form("Demo Form");
        exitCommand =new Command("Exit",Command.EXIT,1);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
        //创建StringItem对象并重新设置对象的字体
        font = Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_ITALIC, Font.SIZE_LARGE);
        strTitle = new StringItem("","StringItemDemo");
        strTitle.setFont(font);
        //创建三个HyperLink 对象
        hlink1 = new HyperLink("SUN","http://www.sun.com",this);
        hlink2 = new HyperLink("IBM","http://www.ibm.com",this);
        hlink3 = new HyperLink("VCHelp","http://www.vchelp.net",this);
        //创建按钮对象
        btn = new Button("Button",this);
        //把所有Item对象添加到Form 中
        form.append(strTitle);
        form.append(hlink1);
        form.append(hlink2);
        form.append(hlink3);
        form.append(btn);
    }
    protected void startApp(  ) throws MIDletStateChangeException
    {
        Display.getDisplay(this).setCurrent(form);
    }

    protected void pauseApp(  )
    {
    }

    protected void destroyApp( boolean p1 )
    {
    }

    public void commandAction(Command c,Displayable d)
    {
        if (c ==exitCommand)
        {
            destroyApp(false);
            notifyDestroyed();
        }
    }
    
    public void commandAction(Command c, Item item) 
    {
        if (c == Button.CLICK_COMMAND) 
        {
            if(item instanceof Button)
            {
                System.out.println("Button "+ ((StringItem)item).getText() +" clicked");
            }
        }
        else if (c == HyperLink.CLICK_COMMAND) 
        {
            if(item instanceof HyperLink)
            {
                System.out.println("Goto "+ ((StringItem)item).getText() );
            }
        }
    }
}