title: CollapsingToolbarLayout and NestedScrollView not working
body: <p>I am trying to implement CollapsingToolbarLayout with a NestedScrollView and it is displaying the TextView within the NestedScrollView at the bottom and not allowing, scrolling or collapsing the Toolbar. I have gotten this to work with a RecyclerView but not NestedScrollView.  When I remove <code>app:layout_behavior="@string/appbar_scrolling_view_behavior</code> the Toolbar collapses but the NestedScrollView is not below the AppBarLayout.  Any solutions or suggestions to fix this?</p>
  
  <p><strong>XML</strong></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"
      android:fitsSystemWindows="true"&gt;
  
      &lt;android.support.v4.widget.NestedScrollView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fitsSystemWindows="true"
          app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
  
          &lt;LinearLayout
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
  
              &lt;TextView
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:gravity="center"
                  android:text="Hello"
                  android:textColor="#000"
                  android:textSize="16sp"/&gt;
          &lt;/LinearLayout&gt;
      &lt;/android.support.v4.widget.NestedScrollView&gt;
  
      &lt;android.support.design.widget.AppBarLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/collapsing_toolbar"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              app:layout_scrollFlags="scroll|exitUntilCollapsed"&gt;
  
              &lt;ImageView
                  android:id="@+id/backdrop"
                  android:layout_width="match_parent"
                  android:layout_height="134dp"
                  android:background="@color/primary"
                  app:layout_collapseMode="parallax"/&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  app:layout_collapseMode="pin"/&gt;
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
      &lt;/android.support.design.widget.AppBarLayout&gt;
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p><strong>Result</strong> </p>
  
  <p><img src="https://i.stack.imgur.com/UilfL.png" alt="enter image description here"></p>