title: Horizontal RecyclerView inside RecyclerView that inside CoordinatorLayout
body: <p>My CollapsingToolbarLayout doesn't work with RecyclerView if that RecyclerView's ViewHolder contains another horizontal RecyclerView. Anyone can help me?First thank you all.
  My main Xml is:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;&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:id="@+id/circlebd_rootview"
  android:layout_width="match_parent"
  android:layout_height="match_parent"&gt;
  &lt;android.support.design.widget.AppBarLayout
          android:layout_width="match_parent"
          android:layout_height="256dip"
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/collapsingToolbarLayout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              app:contentScrim="?attr/colorPrimary"
              app:layout_scrollFlags="scroll|exitUntilCollapsed"&gt;
  
              &lt;ImageView
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:scaleType="centerCrop"
                  android:src="@drawable/header"
                  app:layout_collapseMode="parallax"
                  app:layout_collapseParallaxMultiplier="0.4" /&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  android:minHeight="?attr/actionBarSize"
                  app:layout_collapseMode="pin"
                  app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                  app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" /&gt;
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
      &lt;/android.support.design.widget.AppBarLayout&gt;
  &lt;android.support.v7.widget.RecyclerView
      android:id="@+id/circleinfo_recycler"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/recyclerbg"
      android:fillViewport="true"
      android:layout_marginBottom="?attr/actionBarSize"
      app:layout_behavior="@string/appbar_scrolling_view_behavior"/&gt;&lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>And this is my ViewHodler:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_marginTop="10dip"
  android:background="@color/gray_light"
  android:paddingBottom="1dp"&gt;
  &lt;RelativeLayout
      android:id="@id/con_item_r1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@drawable/contentitem_top"
      android:paddingBottom="10dip"&gt;
  
  &lt;/RelativeLayout&gt;
  &lt;android.support.v7.widget.RecyclerView
      android:id="@id/con_item_recyclerview"
      android:layout_width="match_parent"
      android:layout_height="@dimen/showimg_height"
      android:layout_below="@id/con_item_r1"/&gt;
  </code></pre>
  
  <p></p>
  
  <p>The ViewHolder's RecyclerView is horizontal.And main activity's RecyclerView is vertical. If I change ViewHolder's RecyclerView to View,CollapsingToolbarLayout is OK. My question is how can I use ViewHolder's RecyclerView and also let the CollapsingToolbarLayout work.</p>