BottomNavigationView - Shadow and Ripple Effect : <p>I was really happy when <a href="https://developer.android.com/reference/android/support/design/widget/BottomNavigationView.html" rel="noreferrer">BottomNavigationView</a> was released one week ago but I am facing some problems which makes me unable to solve it, like to see a shadow over the BottomNavigationView, on the same way as Google Photos Android App shows us:</p>

<p><a href="https://i.stack.imgur.com/cQgvG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/cQgvG.png" alt="The shadow over Bottom Navigation Bar"></a></p>

<p>If we tap on an Google Photos menu item, we can see a ripple effect which is tinted blue like the icon and text color (when selected). </p>

<p>Implementing the solution provided by Google only is displayed a gray ripple effect color, and worse, it is not displayed when we change the background color of the bottomnavigationview (<code>design:itemBackground="..."</code>).</p>

<p>Someone knows how to solve it?</p>
