title: How to properly set elevation value to recyclerview?
body: <p>I am working on grid layout using recyclerview in android. The grid occupies a portion of the screen and has a shadow. To get the desired shadow effect I am using an elevation value of 12 dp. But it does not seem to work as I cannot see any elevation (shadow) of the grid. Why is this happening? Does recyclerview not support elevation?</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:id="@+id/activity_grid_layout"
  android:background="@drawable/gradient"
  android:layout_height="match_parent"
  tools:context="com.mindhive.mindhive.activities.GridActivity"&gt;
  
  &lt;android.support.v7.widget.RecyclerView
      android:id="@+id/grid_recycler_view"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_marginBottom="110dp"
      android:layout_marginLeft="15dp"
      android:layout_marginTop="80dp"
      android:background="@color/transparent"
      android:elevation="12dp"
      android:scrollIndicators="none"
      android:scrollbars="none"
      android:padding="0dp" /&gt;
  
  &lt;ImageView
      android:id="@+id/imageView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignBottom="@+id/grid_recycler_view"
      android:layout_alignStart="@+id/grid_recycler_view"
      android:layout_marginBottom="-18dp"
      android:layout_marginStart="67dp"
      android:src="@drawable/main_filter"
      android:elevation="1dp" /&gt;
   ......
  </code></pre>