Mail Sending in Background using AsyncTask

MainActivity.java

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends Activity {
String un,pas;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button send = (Button) this.findViewById(R.id.send);
     
        send.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                          new SendEmailAsyncTask().execute();
                      }
        });
}
class SendEmailAsyncTask extends AsyncTask <Void, Void, Boolean> {

    @Override
protected Boolean doInBackground(Void... params) {
 GMailSender sender = new GMailSender("sender@gmail.com","password");
     try {
      sender.sendMail("subject"," body", "sender@gmail.com", "to@gmail.com");
             System.out.println("send");
             Toast.makeText(getApplicationContext(), "send", Toast.LENGTH_LONG).show();
     } catch (Exception e) {
      System.err.println("err"+e);
   
             Log.e("SendMail", e.getMessage(), e);
     }
return null;
}
      }

}

GMailSender.java

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Security;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import android.annotation.SuppressLint;

@SuppressLint("NewApi")
public class GMailSender extends javax.mail.Authenticator {
    private String mailhost = "smtp.gmail.com";
    private String user;
    private String password;
    private Session session;

    static {
        Security.addProvider(new com.provider.JSSEProvider());
    }

    public GMailSender(String user, String password) {
    System.out.println("uers: "+user);
        this.user = user;
        this.password = password;

        Properties props = new Properties();
        props.setProperty("mail.transport.protocol", "smtp");
        props.setProperty("mail.host", mailhost);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
        //"javax.net.SocketFactory");
              "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.smtp.quitwait", "false");

        session = Session.getDefaultInstance(props, this);
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(user, password);
    }

    public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {
        MimeMessage message = new MimeMessage(session);
        DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
        message.setSender(new InternetAddress(sender));
        message.setSubject(subject);
        message.setDataHandler(handler);
        if (recipients.indexOf(',') > 0)
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
        else
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
        Transport.send(message);
    }

    public class ByteArrayDataSource implements DataSource {
        private byte[] data;
        private String type;

        public ByteArrayDataSource(byte[] data, String type) {
            super();
            this.data = data;
            this.type = type;
        }



        public ByteArrayDataSource(byte[] data) {
            super();
            this.data = data;
        }

        public void setType(String type) {
            this.type = type;
        }

        public String getContentType() {
            if (type == null)
                return "application/octet-stream";
            else
                return type;
        }

        public InputStream getInputStream() throws IOException {
            return new ByteArrayInputStream(data);
        }

        public String getName() {
            return "ByteArrayDataSource";
        }

        public OutputStream getOutputStream() throws IOException {
            throw new IOException("Not Supported");
        }
    }
}

JSSEProvider.java

import java.security.AccessController;

import java.security.Provider;

public class JSSEProvider extends Provider {

public JSSEProvider() {

        super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");

        AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() {

            public Void run() {

                put("SSLContext.TLS",

                        "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");

                put("Alg.Alias.SSLContext.TLSv1", "TLS");

                put("KeyManagerFactory.X509",

                        "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");

                put("TrustManagerFactory.X509",

                        "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");

                return null;

            }

        });

    }

}

ADD 3 jars found in the following link to your Android Project

• mail.jar
• activation.jar
• additionnal.jar

Add this line in your manifest:

<uses-permission android:name="android.permission.INTERNET" />

Reference:

http://stackoverflow.com/questions/2020088/sending-email-in-android-using-javamail-api-without-using-the-default-built-in-a/2033124#2033124