title: How show Navigation bar of button home, menu and back?
body: <p>With some divice android has got 3 button: Home,Menu and Back at the bottom.
  But some divice android phone hasn't got 3 button:  Home,Menu and Back.
  How show 3 button Home,Menu and Back at bottom of screen as Action Bar?
  AS:
  <img src="https://i.stack.imgur.com/s0yzu.png" alt="enter image description here"></p>