我使用JavaMail API在我的Android应用中阅读电子邮件。我调试了我的应用，发现数组中Message个对象的数量等于我收件箱中的电子邮件数量，但我在尝试使用{null时总是getContent 1 {}在message对象上。我使用了here找到的罐子。我正在使用imap.gmail.com以及所有正确的细节。我甚至尝试了一个名为mail.com的不同电子邮件服务，但错误仍然存在。我只提供用于阅读电子邮件的方法。你可以假设其他一切都是正确的。
代码： -
private void initMail(String hostval, String mailStrProt, String uname, String pwd, String authEmail, int mode)
{
uriArrayList = new ArrayList<>();
try {
Log.d("LOGCAT","initMail");
//Set property values
Properties propvals = new Properties();
propvals.put("mail.store.protocol", mailStrProt);
propvals.put("mail.imap.user", uname);
propvals.put("mail.imap.ssl.enable", "true");
propvals.put("mail.imap.host", hostval);
propvals.put("mail.imap.port", "993");
propvals.put("mail.imap.starttls.enable", "true");
Session emailSessionObj = Session.getInstance(propvals, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(uname, pwd);
}
});
//Create POP3 store object and connect with the server
Store storeObj = emailSessionObj.getStore(mailStrProt);
storeObj.connect(hostval, uname, pwd);
//Create folder object and open it in read-only mode
Folder emailFolderObj = storeObj.getFolder("INBOX");
emailFolderObj.open(Folder.READ_ONLY);
//Fetch messages from the folder and print in a loop
Message[] messageobjs = emailFolderObj.getMessages();
for (Message message : messageobjs) {
if(message.getFrom()[0].toString().equals(authEmail)) {
if(message.getContent() instanceof String) { Log.d("LOGCAT","String"); uriArrayList.add(stringToUri(message.getContent().toString())); }
else if(message.getContent() instanceof Multipart) {
Multipart multipart = (Multipart) message.getContent();
MimeBodyPart mimeBodyPart;
for(int i = 0 ; i < multipart.getCount() ; i++) {
if(MimeBodyPart.ATTACHMENT.equalsIgnoreCase(multipart.getBodyPart(i).getDisposition())) {
mimeBodyPart = (MimeBodyPart) multipart.getBodyPart(i);
File file = new File(mimeBodyPart.getFileName());
mimeBodyPart.saveFile(file);
uriArrayList.add(Uri.fromFile(file));
}
}
}
lastReceivedMailDate = message.getSentDate().toString();
}
}
//Now close all the objects
emailFolderObj.close(false);
storeObj.close();
} catch (NoSuchProviderException exp) {
exp.printStackTrace();
} catch (MessagingException exp) {
exp.printStackTrace();
} catch (Exception exp) {
exp.printStackTrace();
}
}
编辑：
for (Message message : messageobjs) {
Multipart multipart = (Multipart) message.getContent();
MimeBodyPart mimeBodyPart;
for(int i = 0 ; i < multipart.getCount() ; i++) {
mimeBodyPart = (MimeBodyPart) multipart.getBodyPart(i);
File file = new File(mimeBodyPart.getFileName()); //line number 204
mimeBodyPart.saveFile(file);
uriArrayList.add(Uri.fromFile(file));
} }