title: How to permanantly disable system ui (navigation bar and status bar) in an android application?
body: <p>Most of the answers I've found only temporarily disable these features, and then opening a soft keyboard or alert dialog shows them again.</p>
  
  <p>The requirement: The end user of this device should not be able to navigate out of the application while it is running. Administrators can do this by using a private combination of physical keypad buttons, but otherwise the application should alway stay open.</p>
  
  <p>...How can I do this? I've read that android does not allow the disabling of these features for security reasons, but can anyone give me an idea for a work-around?</p>