formdemo.java

J2ME MIDP 2.0 无线设备编程的一些源码

//formDemo.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class formDemo extends MIDlet implements CommandListener, ItemStateListener 
{
    private Command exitCommand;
    private Form form;
    public formDemo()
    {
        exitCommand =new Command("Exit",Command.EXIT,1);
        form = new Form("summary form");
        form.addCommand(exitCommand);
        //设置命令监听对象
        form.setCommandListener(this);
        form.append("Fill the Form to Register a new account\n\rAll the blank will be filled !");
        form.append(new TextField("Name","",10,TextField.ANY));
        form.append(new TextField("Birth(YYMMDD)","",6,TextField.NUMERIC));
        form.append(new TextField("Email","",40,TextField.EMAILADDR));
        form.append(new TextField("Phone","",20,TextField.PHONENUMBER));
        form.append(new TextField("Fax","",20,TextField.PHONENUMBER));
        form.append(new TextField("Homepage","",40,TextField.URL));
        form.append(new TextField("Password","",6,TextField.PASSWORD));
        form.append(new TextField("Password confirm","",6,TextField.PASSWORD));
        form.append(new TextField("ur intro","",200,TextField.ANY));
        //从上面的代码我们注意到我们没有保存每个被创建的TextField 对象
        //当我们需要使用这些对象时我们可以利用Form.get(int itemNum) 从对象位置来得到每个对象
        //设置状态监听对象
        form.setItemStateListener(this);
    }
    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 itemStateChanged(Item item)
    {
        if( item instanceof TextField)
        {
            System.out.println("TextField : "+ ((TextField)item).getLabel() +" changed");
            System.out.println("LastValue : "+ ((TextField)item).getString() );
        }
    }
}