title: How to hide toolbar while scrolling listview up? (Just like google play store)
body: <p>Ok, so hiding the action bar is something doable. But, how can we hide the (newly introduced) toolbar in our activity?</p>
  
  <p>I am making an app with an activity having theme as  theme.apcompat.light.noactionbar(to hide the action bar) , I have placed a toolbar with slidingtablayout below it. And below it is my listview. </p>
  
  <p>What I want is to hide the toolbar when I scroll the listview up. But the slidingtablayout should remain there. And while in middle of the listview  if I scroll down, the toolbar should again be visible. </p>