title: Collapsing Toolbar Layout expand on click event and not on scroll
body: <p>I have a simple toolbar with a info icon item on the right.
  When click on the item I would like to expand the toolbar with an animation. With a new view and a FAB button.
  Like the Textra SMS is doing.</p>
  
  <p>When clicking outside the expanded toolbar, I want to colapse the toolbar.</p>
  
  <p>I looking how can I handle this with CollapsingToolbarLayout? Is it possible?
  All the example I find on the web are collapsing/Expanding with the scroll of the the view (Recyclerview, Scrollview etc...). But I don't want my toolbar to move when scrolling my view.</p>
  
  <p>It is a good way to use CollapsingToolbarLayout? or do I need to do it all by myself?</p>