Android new Bottom Navigation bar or BottomNavigationView
<p>Saw the new guideline came out, and used in <code>google photos</code> latest app.
Have no idea how to use the new Bottom Navigation Bar.
See through the new support lib, didn't find any lead.</p>

<p><img src="https://i.stack.imgur.com/6lcXBm.png" alt="enter image description here"></p>

<p>Can not find any official sample.</p>

<p>How to use the new Bottom bar? Don't want to do any customize.</p>