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我正在尝试开发一个使用 JavaMail 发送电子邮件的 android 应用程序。我已经尝试将下面的代码作为控制台应用程序并且它可以工作，但是当我从模拟器中用作 android 应用程序时，它会抛出异常而没有任何消息。我已经修改了 manifest.xml 并把 

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

但它仍然不起作用。抛出异常message.setText("Welcome to JavaMail"); 所以请帮帮我！

我正在使用Sun的mail.jarand 。activation.jar

Bellow 是 ClickHandler 的完整代码。 

 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();
                      }}
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1 回答 1

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如果您使用以下方式设置主体，也许可以解决异常：

_multipart = new MimeMultipart();

BodyPart messageBodyPart = new MimeBodyPart();

messageBodyPart.setText("Welcome to JavaMail");

_multipart.addBodyPart(messageBodyPart);

message.setContent(_multipart);

于 2011-04-27T16:37:06.860 回答