Disabling Android O auto-fill service for an application

So I have my own class which is extends the android.support.v7.widget.AppCompatEditText

 and all I did is overwrote the following method with the following value:

@Override
public int getAutofillType() {
    return AUTOFILL_TYPE_NONE;
}

no other solutions worked, not even android:importantForAutofill="no".

getAutofillType() comes from the View class, so it should work for every other 

class such as TextInputEditText too!