我有两个活动，一个是使用 Imap 接收电子邮件，第二个是使用 SMTP 发送电子邮件。发送电子邮件活动的按钮位于接收电子邮件活动中，因此接收电子邮件活动必须在发送电子邮件活动之前运行。
Could not connect to SMTP host: localhost, port: 25我的问题是我不断收到一个异常说
Transport.send(new_message)
但是，如果我在没有先调用接收电子邮件活动的情况下运行相同的活动，那么它可以正常工作。有人可以帮我解释为什么会这样吗？
这是 RecieveEmail 异步任务的代码（完整的活动代码太长）
try{
Properties props = new Properties();
props.setProperty( "mail.imaps.socketFactory.class", "com.X509TrustAll.DummySSLSocketFactory" );
Log.v("EmailList", "Stting properties");
// Get the default Session object.
session = Session.getDefaultInstance(props, null);
Log.v("EmailList", "Geting Default Instance");
// Get a Store object that implements the specified protocol.
store = session.getStore("imaps");
Log.v("EmailList", "Getting Sesion");
//Connect to the current host using the specified username and password.
Log.v("EmailList", "Connecting...");
store.connect(host,port, user, password);
Log.v("EmailList", "Connected");
//Create a Folder object corresponding to the given name.
Folder[] folders = store.getDefaultFolder().list("*");
Log.v("EmailList", "Got Folder List");
folder = folders[5];
// Open the Folder.
Log.v("EmailList", "Opening Folder");
folder.open(Folder.READ_ONLY);
Log.v("EmailList", "Getting Messages");
messages = folder.getMessages();
Log.v("EmailList", "Got Messages");
} catch (Exception e){
Log.v("EmailList", "Exception");
}
}
for (int i = lastMessageNumber -1; i >= interateUpto; i--) {
Log.v("EmailRecieve", "Email no. " + Integer.toString(i));
javax.mail.Address[] froms = messages[i].getFrom();
String emailAdress = froms == null ? null : ((InternetAddress) froms[0]).getAddress();
FromAsync.add(emailAdress);
SubjectAsync.add(messages[i].getSubject());
SentDateAsync.add(messages[i].getSentDate().toString());
Part part = messages[i];
checkAttachments(part);
if (messages[i].isSet(Flag.SEEN)){
SeenAsync.add("true");
}else{
SeenAsync.add("false");
}
}
lastMessageNumber = lastMessageNumber - 19; //new last number is stored
folder.close(false);
store.close();
} catch (Exception e){
Log.v("EmailList", "Exception");
}
Log.v("EmailList", "Retrieve Email Finished");
return null;
}
这是发送电子邮件的代码（同样，完整的代码太长了，所以我只发布相关的内容，即 UI 等未发布
@Override
protected Void doInBackground(Void... arg0) {
//Recipient's email ID needs to be mentioned.
String to = To.getText().toString();
// Sender's email ID needs to be mentioned
String from = "foobar@foobar.hehe";
// The Host
String smtphost = "www.isleworthsyon.hounslow.sch.uk";
// Get system properties
Properties smtpproperties = System.getProperties();
// Setup mail server
smtpproperties.setProperty("mail.smtp.host", smtphost);
// Get the default Session object.
Session smtpsession = Session.getDefaultInstance(smtpproperties);
try{
MimeMessage new_message = new MimeMessage(smtpsession);
// Set From:
new_message.setFrom(new InternetAddress(from));
// Set To:
new_message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
// Set Subject:
new_message.setSubject(Subject.getText().toString());
if (hasAttachment == true){
// Create the message part
BodyPart messageBodyPart = new MimeBodyPart();
// Fill the message
messageBodyPart.setText(Body.getText().toString());
// Create a multipar message
Multipart multipart = new MimeMultipart();
// Set text message part
multipart.addBodyPart(messageBodyPart);
// Iterating over all Attachments
for (int i=0; i < attachmentFiles.size(); i++){
if (attachmentFiles.get(i).equals("null") != true) {
messageBodyPart = new MimeBodyPart();
String filename = attachmentFiles.get(i);
FileDataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(source.getName());
multipart.addBodyPart(messageBodyPart);
}
}
new_message.setContent(multipart);
}else{
// Set Body if not attaching anything
new_message.setText(Body.getText().toString());
}
// Send message
Transport.send(new_message);
sendingSuccesfull = true;
}catch (MessagingException mex) {
sendingSuccesfull = false;
Log.v("Email Compose", "Message Sending Failed, Details: " + mex.getMessage());
}
return null;
}