to start gmail with extra string

IntentGmail.java

    final Intent intentGmail = new Intent(Intent.ACTION_VIEW);
    intentGmail.setClassName("com.google.android.gm","com.google.android.gm.ComposeActivityGmail");
    intentGmail.putExtra(Intent.EXTRA_EMAIL, new String[] { "user@email.com" });
    intentGmail.putExtra(Intent.EXTRA_SUBJECT, "SUBJECT EMAIL");
    intentGmail.setType("plain/text");
    intentGmail.putExtra(Intent.EXTRA_TEXT, "message email is here.."
    );

    try {
        startActivity(intentGmail);
    }catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(getActivity(), getString(R.string.message_gmail_not_installed), Toast.LENGTH_SHORT).show();
    }