Android – Send email via GMail (actually via SMTP)

Here is a screen shot.

The main activity is pretty simple

package org.apache.android.mail;

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

public class SendMail extends Activity {
    /**
     * Called with the activity is first created.
     */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        final Button send = (Button) this.findViewById(R.id.send);
        final EditText userid = (EditText) this.findViewById(R.id.userid);
        final EditText password = (EditText) this.findViewById(R.id.password);
        final EditText from = (EditText) this.findViewById(R.id.from);
        final EditText to = (EditText) this.findViewById(R.id.to);
        final EditText subject = (EditText) this.findViewById(R.id.subject);
        final EditText body = (EditText) this.findViewById(R.id.body);
        send.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                GMailSender sender = new GMailSender(userid.getText().toString(), password.getText().toString());
                try {
                    sender.sendMail(subject.getText().toString(),
                            body.getText().toString(),
                            from.getText().toString(),
                            to.getText().toString());
                } catch (Exception e) {
                    Log.e("SendMail", e.getMessage(), e);
                }
            }
        });
    }
}

The GMail Sender code is from here

package org.apache.android.mail;

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

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 org.apache.harmony.xnet.provider.jsse.JSSEProvider());
    }

    public GMailSender(String user, String password) {
        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.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");
        }
    }
}

Notes

• We use activation-1.1.jar and mail-1.4.jar from SUN


• Picked up a few classes in java.awt.datatransfer package from Apache Harmony SVN (and stripped them down)


• Picked up the ByteArrayDataSource class from Apache Axis


• build.xml adds the 2 jars and the additional harmony/axis classes into the classes.dex as well

Download Source and APK from here – SendMail.zip