title: How to hide toolbar fully under status bar when scrolling recyclerview
body: <p>I try to make scrolling behavior for toolbar as embodied in Google Photo. But my toolbar not hiding fully under status bar.</p>
  
  <p><a href="https://i.stack.imgur.com/pY0fZ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pY0fZ.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/gIZzB.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gIZzB.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/2jips.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2jips.png" alt="enter image description here"></a></p>
  
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"&gt;
  &lt;android.support.design.widget.AppBarLayout
      android:id="@+id/appbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:background="@color/colorPrimary"
          app:layout_scrollFlags="scroll|enterAlways|snap" /&gt;
  &lt;/android.support.design.widget.AppBarLayout&gt;
  &lt;android.support.v7.widget.RecyclerView
      android:id="@+id/rv"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:clipToPadding="false"
      android:clipChildren="false"
      app:layout_behavior="@string/appbar_scrolling_view_behavior" /&gt;
  </code></pre>
  
  <p></p>