start class in new thread
===

(API level 12)
I have implemented the javax.mail to be able to send Emails after the user enter the login name and password. For some reason I was able to run it one time and email went of. Now I get an error NetworkOnMainThreadException. I look around and I see that you can start a new thread like this:
   
      Thread onRun = new Thread{
          public void run() {
               try{
                   mail.send();
               }catch(Exception e) {
               }
          }
       };
       onRun.Start();

But the application crash when i add it.

Is there a way to always have the class running in a new thread so I never get the error?
Thanks for any help.

    public class Mail extends javax.mail.Authenticator { 
    private String _user; 
    private String _pass; 
 
    private String[] _to; 
    private String _from; 
 
    private String _port; 
    private String _sport; 
 
    private String _host; 
 
    private String _subject; 
    private String _body; 
 
    private boolean _auth; 
   
    private boolean _debuggable; 
 
    private Multipart _multipart; 
 
 
    public Mail() { 
    _host = ""; // default smtp server 
    _port = ""; // default smtp port 
    _sport = ""; // default socketfactory port 
 
    _user = ""; // username 
    _pass = ""; // password 
    _from = ""; // email sent from 
    _subject = ""; // email subject 
    _body = ""; // email body 
 
    _debuggable = false; // debug mode on or off - default off 
    _auth = true; // smtp authentication - default on 
 
    _multipart = new MimeMultipart(); 
 
    // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
    MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
    mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
    mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
    mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain"); 
    mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
    mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822"); 
    CommandMap.setDefaultCommandMap(mc); 
    } 
 
    public Mail(String user, String pass) { 
     this(); 
 
    _user = user; 
    _pass = pass; 
    } 
 
    public boolean send() throws Exception { 
       Properties props = _setProperties(); 
 
    if(!_user.equals("") && !_pass.equals("") && _to.length > 0 && !_from.equals("") && !_subject.equals("") && !_body.equals("")) { 
      Session session = Session.getInstance(props, this); 
 
      MimeMessage msg = new MimeMessage(session); 
 
      msg.setFrom(new InternetAddress(_from)); 
       
      InternetAddress[] addressTo = new InternetAddress[_to.length]; 
      for (int i = 0; i < _to.length; i++) { 
        addressTo[i] = new InternetAddress(_to[i]); 
      } 
        msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 
 
      msg.setSubject(_subject); 
      msg.setSentDate(new Date()); 
 
      // setup message body 
      BodyPart messageBodyPart = new MimeBodyPart(); 
      messageBodyPart.setText(_body); 
      _multipart.addBodyPart(messageBodyPart); 
 
      // Put parts in message 
      msg.setContent(_multipart); 
 
      // send email 
      Transport.send(msg); 
 
      return true; 
    } else { 
      return false; 
    } 
    } 
 
    public void addAttachment(String filename) throws Exception { 
    BodyPart messageBodyPart = new MimeBodyPart(); 
    DataSource source = new FileDataSource(filename); 
    messageBodyPart.setDataHandler(new DataHandler(source)); 
    messageBodyPart.setFileName(filename); 
 
    _multipart.addBodyPart(messageBodyPart); 
    } 
 
    @Override 
    public PasswordAuthentication getPasswordAuthentication() { 
       return new PasswordAuthentication(_user, _pass); 
    } 
 
    private Properties _setProperties() { 
    Properties props = new Properties(); 
    
    props.put("mail.smtp.host", _host); 
    
    if(_debuggable) { 
      props.put("mail.debug", "true"); 
    } 
 
    if(_auth) { 
      props.put("mail.smtp.auth", "false"); 
    } 
    
    props.put("mail.smtp.port", _port); 
    props.put("mail.smtp.socketFactory.port", _sport); 
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
    props.put("mail.smtp.socketFactory.fallback", "false"); 
 
    return props; 
    } 
 
    // the getters and setters 
    public String getBody() { 
    return _body; 
    } 
 
    public void setBody(String _body) { 
    this._body = _body; 
    } 
 
    public void setTo(String[] toArr) {
	  this._to = toArr;
	  }

    public void setFrom(String string) {
	  this._from = string;
	  }

    public void setSubject(String string) {
	  this._subject = string;
	  } 
  
    public void setSMTP(String string) {
	  this._host = string;
	  }

    public void setPort(String string) {
	  this._port = string;
	  } 
    public void setSPort(String string) {
	  this._sport = string;
	  } 
  
    } 
