how to open gmail Intent in android

/* Create the Intent */
            Intent email = new Intent(Intent.ACTION_SEND);
            email.putExtra(Intent.EXTRA_EMAIL,new String[] { "xyz@gmail.com" });
            email.putExtra(Intent.EXTRA_SUBJECT, "SUBJECT");
            email.putExtra(Intent.EXTRA_TEXT, "MESSAGE");
            email.setType("message/rfc822");
            email.setClassName("com.google.android.gm", "com.google.android.gm.ComposeActivityGmail");
            startActivity(email);