用J2ME实现简单电子邮件发送功能[2]

    public void init()
    {
        toField = new TextField("To:", null, 25, TextField.ANY);
        subField = new TextField("Subject:", null, 30, TextField.ANY);
        this.append(toField);
        this.append(subField);
        this.addCommand(nextCommand);
        this.setCommandListener(this);
       
    }
   
    public void commandAction(Command cmd,Displayable disp)
    {
        if(cmd == nextCommand)
        {
            String to = toField.getString();
            String subject = subField.getString();
            if(to == "" && subject == "")
            {
                midlet.displayAlert("Null to or sub",AlertType.WARNING,this);
            }
            else
            {
                midlet.getMessage().setTo(to);
                midlet.getMessage().setSubject(subject);
                midlet.getDisplay().setCurrent(midlet.getContentForm());
            }
        }
    }

}

package com.j2medev.mail;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.midlet.MIDlet;

public class ContentForm extends TextBox implements CommandListener
{
    private MailClient midlet;

    private boolean first = true;

    public static final Command sendCommand = new Command("SEND", Command.ITEM,
            1);

    public ContentForm(String arg0, String arg1, int arg2, int arg3,
            MailClient midlet)
    {
        super(arg0, arg1, arg2, arg3);
        this.midlet = midlet;
        if (first)
        {
            first = false;
            init();
        }

    }

    public void init()
    {
        this.addCommand(sendCommand);
        this.setCommandListener(this);
    }