Send Email Programmatically in android without Intent

package com.dhaval.activity;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;


public class Mailing extends Activity {
    public String jobNo;
    public String teamNo;
    private static final String username = "mail@gmail.com";
    private static final String password = "123456";
    private static final String emailid = "mail2@outlook.com";
    private static final String subject = "Photo";
    private static final String message = "Hello";
    private Multipart multipart = new MimeMultipart();
    private MimeBodyPart messageBodyPart = new MimeBodyPart();
    public File mediaFile;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera_screen);
        Intent intent = getIntent();
        jobNo = intent.getStringExtra("Job_No");
        teamNo = intent.getStringExtra("Team_No");
        sendMail(emailid, subject, message);

    }

    private void sendMail(String email, String subject, String messageBody) {
        Session session = createSessionObject();

        try {
            Message message = createMessage(email, subject, messageBody, session);
            new SendMailTask().execute(message);
        } catch (AddressException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }


    private Session createSessionObject() {
        Properties properties = new Properties();
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
        properties.put("mail.smtp.host", "smtp.gmail.com");
        properties.put("mail.smtp.port", "587");

        return Session.getInstance(properties, new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });
    }

    private Message createMessage(String email, String subject, String messageBody, Session session) throws
            MessagingException, UnsupportedEncodingException {
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("mail2@outlook.com", "Naveed Qureshi"));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(email, email));
        message.setSubject(subject);
        message.setText(messageBody);
        return message;
    }


    public class SendMailTask extends AsyncTask<Message, Void, Void> {
        private ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = ProgressDialog.show(Mailing.this, "Please wait", "Sending mail", true, false);
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            progressDialog.dismiss();
        }

        protected Void doInBackground(javax.mail.Message... messages) {
            try {
                Transport.send(messages[0]);
            } catch (MessagingException e) {
                e.printStackTrace();
            }
            return null;
        }
    }
}