In a web app I'm working on the login screen includes the "<" menu button, even though there's no explicit code in that WebView - I imagine it's included in it's class or superclass definition. If the user taps it (which there is no reason to do, but ... users.) it goes to an empty white screen and you can't get back to the actual web app. Running in a browser you'd just close the tab and re-enter the url, but when you've saved it to your home screen on a phone, even completely closing the app and re-starting it does not get you out of it.

What I'd really like to do is have nothing on my login screen aside from the username/password forms and the Login button. Is there a way to not render the back menu button?