Send email via gmail

I have a code the fires intent for sending email

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL,
                new String[] { to });
i.putExtra(Intent.EXTRA_SUBJECT, subject);
i.putExtra(Intent.EXTRA_TEXT, msg);
try {
    startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
    Toast.makeText(Start.this,
                    "There are no email clients installed.",
                    Toast.LENGTH_SHORT).show();
}

But when this intent is fired I see many item in the list like sms app , gmail app, facebook app and so on.

How can I filter this and enable only gmail app (or maybe just email apps)?