title: Hide/Show Toolbar programmatically on CoordinatorLayout
body: <p>When I scroll my <code>RecycleView</code> <code>ToolBar</code> hide or show (with animation).
  <a href="https://i.stack.imgur.com/vrYXl.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/vrYXl.jpg" alt="enter image description here"></a> </p>
  
  <p>How I can return <code>ToolBar</code> back programmatically?</p>