on your onclick method add this code
 Mail m = new Mail("[email protected]", "yourgmailpassword");

                            String[] toArr = {"abc@gmail"};// this is the
gmail id on which your email is sent
                            m.setTo(toArr);
                            m.setFrom("[email protected]");
                            m.setSubject("My File!!!");
                            m.setBody("Please download the enclosed
attachment to read all details........");

                            try {
                              m.addAttachment("/sdcard/download/abc.txt");
//file you want to send in attachment


                              m.send();
                                                           /* if(m.send())
{
                                Toast.makeText(mContext, "Email was sent
successfully.", Toast.LENGTH_LONG).show();
                              } else {
                                Toast.makeText(mContext, "Email was not
sent.", Toast.LENGTH_LONG).show();
                              } */
                            } catch(Exception e) {

                              Log.e("debug", "Could not send email", e);
                            }
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
now create a new class name Mail and add this code


import java.security.Security;
import java.util.Date;
import java.util.Properties;
import javax.activation.CommandMap;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.activation.MailcapCommandMap;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class Mail extends javax.mail.Authenticator {
    private String _user;
    private String _pass;

    private String[] _to;
    private String _from;

    private String _port;
    private String _sport;

    private String _host;

    private String _subject;
    private String _body;

    private boolean _auth;

    private boolean _debuggable;

    private Multipart _multipart;


    public Mail() {
        _host = "smtp.gmail.com"; // default smtp server
        _port = "465"; // default smtp port
        _sport = "465"; // default socketfactory port

        _user = "[email protected]"; // username
        _pass = "yourgmailpassword"; // password
        _from = "[email protected]"; // email sent from
        _subject = "Testing E-mail"; // email subject
        _body = "Testing E-mail"; // email body

        _debuggable = false; // debug mode on or off - default off
        _auth = true; // smtp authentication - default on

        _multipart = new MimeMultipart();

        // There is something wrong with MailCap, javamail can not find a
        // handler for the multipart/mixed part, so this bit needs to be
added.
        MailcapCommandMap mc = (MailcapCommandMap)
CommandMap.getDefaultCommandMap();
        mc.addMailcap("text/html;;
x-java-content-handler=com.sun.mail.handlers.text_html");
        mc.addMailcap("text/xml;;
x-java-content-handler=com.sun.mail.handlers.text_xml");
        mc.addMailcap("text/plain;;
x-java-content-handler=com.sun.mail.handlers.text_plain");
        mc.addMailcap("multipart/*;;
x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        mc.addMailcap("message/rfc822;;
x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        CommandMap.setDefaultCommandMap(mc);
    }


    public Mail(String user, String pass) {
        this();

        _user = user;
        _pass = pass;
    }

     public void setTo(String[] toArr){
         _to = toArr;
     }

     public void setFrom(String from){
         _from = from;
     }
     public void setSubject(String subject){
         _subject = subject;
     }

    public boolean send() throws Exception {
        Properties props = _setProperties();

        if (!_user.equals("") && !_pass.equals("") && _to.length > 0
                && !_from.equals("") && !_subject.equals("")
                && !_body.equals("")) {
            Session session = Session.getInstance(props, this);

            MimeMessage msg = new MimeMessage(session);

            msg.setFrom(new InternetAddress(_from));

            InternetAddress[] addressTo = new InternetAddress[_to.length];
            for (int i = 0; i < _to.length; i++) {
                addressTo[i] = new InternetAddress(_to[i]);
            }
            msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);

            msg.setSubject(_subject);
            msg.setSentDate(new Date());

            // setup message body
            BodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText(_body);
            _multipart.addBodyPart(messageBodyPart);

            // Put parts in message
            msg.setContent(_multipart);

            // send email
            Transport.send(msg);

            return true;
        } else {
            return false;
        }
    }

    public void addAttachment(String filename) throws Exception {
        BodyPart messageBodyPart = new MimeBodyPart();
        DataSource source = new FileDataSource(filename);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(filename);

        _multipart.addBodyPart(messageBodyPart);
    }

    @Override
    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(_user, _pass);
    }

    private Properties _setProperties() {
        Properties props = new Properties();

        props.put("mail.smtp.host", _host);

        if (_debuggable) {
            props.put("mail.debug", "true");
        }

        if (_auth) {
            props.put("mail.smtp.auth", "true");
        }

        props.put("mail.smtp.port", _port);
        props.put("mail.smtp.socketFactory.port", _sport);
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");

        return props;
    }

    // the getters and setters
    public String getBody() {
        return _body;
    }

    public void setBody(String _body) {
        this._body = _body;
    }
    static {
       Security.addProvider(new com.example.apps.JSSEProvider());
   }


}

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