title: Change Collapsing toolbar menu icons color on scroll
body: <p>How to create Toolbar like <strong>Google trips</strong> application Trip Screen  [Please check the image in the below link]. 
  <a href="https://i.stack.imgur.com/kZVnC.jpg" rel="nofollow noreferrer">https://i.stack.imgur.com/kZVnC.jpg</a> ,</p>
  
  <p>Before scroll toolbar menu icons will be in white colour. After scroll toolbar is collapsed menu icons will be changed to grey colour.</p>