I want to give the option to show / hide the system UI.
I can do it with a button and with TaifunTools (Show(/Hide)SystemUI).
Many phones have a phisical home-button, so have no systemUI.
Thats why my button has no function, so in this case I want to hide it.
Can I find out somehow if a phone has a physical 'Home' button, (and screen independent 'Back' and 'Running apps' buttons)?