从Android应用发送电子邮件

Question

I am trying to a develop an android app that sends email using JavaMail. I have tried the code bellow as console application and it works, but when I use in as an android app from the emulator it throws exception with no message. I have modified the manifest.xml and put

<uses-permission android:name="android.permission.INTERNET" /> 

but it still doesn't work. The exception is thrown at message.setText("Welcome to JavaMail"); So please help me out!

I am using the mail.jar and activation.jar from Sun.

Bellow is the full code on the ClickHandler.

 public void btnSendClickHandler(View view)
   {
    try{

        String host = "smtp.gmail.com";
        String from = "Username@gmail.com";
        String pass = "Password";
        Properties props = System.getProperties();
        props.put("mail.smtp.starttls.enable", "true"); // added this line
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        String[] to = {"toEmailAddress@gmail.com"}; // added this line

        Session session = Session.getDefaultInstance(props, null);

        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));

        InternetAddress[] toAddress = new InternetAddress[to.length];

        // To get the array of addresses
        for( int i=0; i < to.length; i++ ) { 
            toAddress[i] = new InternetAddress(to[i]);
        }


        for( int i=0; i < toAddress.length; i++) {
            message.addRecipient(Message.RecipientType.TO, toAddress[i]);
        }

        message.setSubject("sending in a group");
        message.setText("Welcome to JavaMail");//The exception is thrown here   

        Transport transport = session.getTransport("smtp");
        transport.connect(host, from, pass);
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
 } catch(Exception e){Toast.makeText(this, e.toString(),
        Toast.LENGTH_LONG).show();
                      }}

Answer 1

如果使用以下方式设置主体，也许可以解决该异常：

_multipart = new MimeMultipart();

BodyPart messageBodyPart = new MimeBodyPart();

messageBodyPart.setText("Welcome to JavaMail");

_multipart.addBodyPart(messageBodyPart);

message.setContent(_multipart);