Send email in Android

package com.thieumao.mail;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class MainActivity extends AppCompatActivity {

    Session session;
    ProgressDialog pdialog;
    Context context;
    EditText reciep, sub, msg;
    String rec, subject, textMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        context = this;
        rec = "thieumao@gmail.com";

//        Button login = (Button) findViewById(R.id.btn_submit);
//        reciep = (EditText) findViewById(R.id.et_to);
//        sub = (EditText) findViewById(R.id.et_sub);
//        msg = (EditText) findViewById(R.id.et_text);
    }

    /** Called when the user touches the button */
    public void sendMessage(View view) {
        // Do something in response to button click
//        rec = reciep.getText().toString();
//        subject = sub.getText().toString();
//        textMessage = msg.getText().toString();

        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");

        session = Session.getDefaultInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("tengido@gmail.com", "thieumao");
            }
        });

        pdialog = ProgressDialog.show(context, "", "Sending Mail...", true);

        RetreiveFeedTask task = new RetreiveFeedTask();
        task.execute();
    }

    class RetreiveFeedTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {

            try{
                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress("leoski94@gmail.com"));
                message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(rec));
                message.setSubject(subject);
                message.setContent(textMessage, "text/html; charset=utf-8");
                Transport.send(message);
            } catch(MessagingException e) {
                e.printStackTrace();
            } catch(Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
//            pdialog.dismiss();
//            reciep.setText("");
//            msg.setText("");
//            sub.setText("");
//            Toast.makeText(getApplicationContext(), "Message sent", Toast.LENGTH_LONG).show();
        }
    }

}