使用asyntask

Question

我正在开发一个Android应用程序。连接到gmail服务器和读取收件箱电子邮件。我实现连接和电子邮件阅读代码，但问题是，当应用程序。正在与应用程序的gmail服务器连接。挂起，当它从gmail服务器读取电子邮件时，它会停止工作一段时间然后正常运行。我想使用asyntask在后台放置连接和读取电子邮件代码。 请告诉我如何在android中使用asyntask实现连接和读取电子邮件代码，以便我的应用程序。不会挂起或崩溃或停止？

public void readGmail(String host, String storeType, String user, String password, SQLiteDatabase database) {
    try {
        Properties properties = new Properties();
        properties.put("mail.pop3.host", host);
        properties.put("mail.pop3.port", "995");
        properties.put("mail.pop3.starttls.enable", "true");
        Session emailSession = Session.getDefaultInstance(properties);
        store = emailSession.getStore("pop3s");
        store.connect(host, user, password);
        Folder emailFolder = store.getFolder("INBOX");
        emailFolder.open(Folder.READ_ONLY);
        Message[] messages = emailFolder.getMessages();
        for (int i = 0; i < messages.length; i++) {
            Message message = messages[i];
            Object obj = message.getContent();
            int Email = message.getMessageNumber();
            String subject = message.getSubject();
            String emailDateTime = String.valueOf(message.getSentDate());
            String from = String.valueOf(message.getFrom()[0]);
            String sendFrom=from.substring(from.indexOf("<") + 1, from.indexOf(">"));
            Multipart mp = (Multipart) message.getContent();
            BodyPart bp = ((Multipart) message.getContent()).getBodyPart(0);
            if (bp.isMimeType("text/plain")) {
                String body = (String) bp.getContent();
                AddEmail addEmail = new AddEmail();
                DbHelper dbHelper = new DbHelper(getApplicationContext());
                //SQLiteDatabase database = dbHelper.getWritableDatabase();
                addEmail.EmailInsert(sendFrom, subject, body, emailDateTime, "Pending...", "", Data.getUserEmail, Data.getUserPassword, database);
            }
        }

        for (int i = 0, n = messages.length; i < n; i++) {
            Message message = messages[i];
            System.out.println("Email Number " + (i + 1));
        }
        //SMSSendActivity smsSendActivity = new SMSSendActivity();
        //smsSendActivity.SMSPerodicTimer(database);
        emailFolder.close(false);
        store.close();
    } catch (NoSuchProviderException e) {
        e.printStackTrace();
    } catch (MessagingException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}