How to send the email using Android Code [closed]
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"recipient@example.com"});
i.putExtra(Intent.EXTRA_SUBJECT, "subject of email");
i.putExtra(Intent.EXTRA_TEXT   , "body of email");
try {
    startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
    Toast.makeText(MyActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);

String[] recipients = new String[]{"my@email.com", "",};

emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, recipients);

emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Test");

emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, "This is email's message");

emailIntent.setType("text/plain");

startActivity(Intent.createChooser(emailIntent, "Send mail..."));

String to = "abcd@gmail.com";

    String from = "web@gmail.com";

    Properties properties = System.getProperties();

    properties.setProperty("mail.smtp.host", SMPT_HOSTNAME);

    Session session = Session.getInstance(properties, new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(USERNAME, PASSWORD);
        }
    });

    try {
        MimeMessage message = new MimeMessage(session);

        message.setFrom(new InternetAddress(from));

        message.addRecipient(Message.RecipientType.TO, new InternetAddress(
                to));

        message.setSubject("This is the Subject Line!");

        message.setText("This is actual message");

        Transport.send(message);
        System.out.println("Sent message successfully....");
    } catch (MessagingException mex) {
        mex.printStackTrace();
    }