title: Android bottom navigation with rounded button
body: <p>I want to do something like this in my android app. 
  I tryied with app bar and fab button but was unsuccessful.
  Do you have any ideas?</p>
  
  <p><a href="https://i.stack.imgur.com/0kqv8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0kqv8.png" alt="Bottom navigation"></a></p>