title: How to put a list (RecyclerView or Listview) inside a CollapsingToolbar?
body: <p>I'm trying to put a scrollable list inside a CollapsingToolbar, but it's not working. The list appears but does not scroll. I want to put a list that appears inside the Toolbar. For example, it is possible to place an image inside a CollapsingToolbar, rather than an image I want to place a type of scrool view. So the layout of the screen will have two lists: one main below the Toolbar and another within the Toobar, which appears when Tooblar is expanded.</p>
  
  <pre><code>  &lt;android.support.design.widget.AppBarLayout
          android:id="@+id/appbar"
          android:layout_width="match_parent"
          android:layout_height="250dp"
          android:theme="@style/AppTheme.AppBarOverlay"&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;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  android:background="?attr/colorPrimary"
                  android:gravity="center_vertical|start"
                  app:layout_collapseMode="pin"
                  app:popupTheme="@style/AppTheme.PopupOverlay"&gt;
  
              &lt;/android.support.v7.widget.Toolbar&gt;
  
              &lt;LinearLayout
                  android:layout_width="match_parent"
                  android:layout_height="250dp"&gt;
  
                  &lt;android.support.v7.widget.RecyclerView
                      android:id="@+id/ultimate_recyclerview"
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:scrollbars="vertical" /&gt;
              &lt;/LinearLayout&gt;
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  </code></pre>
  
  <p>The CollapsingToolbar is working properly and I get the click on each item but the list does not scroll.</p>
  
  <p>Does anyone know how I can do this?</p>