title: Android Toolbar + Tab Layout + Drawer, Hide toolbar when scrolling and take TabLayout to the top
body: <p>I have activity which has drawer attached to it. Each menu of the drawer is a fragment, and under one of the menu I have a fragment with <code>TabLayout</code>, and each tab contains a <code>RecyclerView</code>. 
  So now, when I scroll the <code>RecyclerView</code>, tab layout is getting hidden but <code>ToolBar</code> remains at the top. What I need is to <code>ToolBar</code> to get hidden(<code>scrollFlags:scroll|enterAlways</code>), and <code>TabLayout</code> should get shown at the top.</p>
  
  <p>So current setup is:</p>
  
  <p><code>Activity with attached DrawerLayout
      -&gt; Fragment with TabLayout
            -&gt; Tab Fragment 1 with RecyclerView
            -&gt; Tab Fragment 2 with RecyclerView</code></p>