title: CardView not showing Shadow in Android L
body: <p>My Cardview inside Listview is not showing shadow in Android L(Nexus 5). Also the round edges are not properly shown. Here is the code for Listview's Adapter View :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:card_view="http://schemas.android.com/apk/res-auto"
  xmlns:app="http://schemas.android.com/apk/res/com.example.myapp"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" &gt;
  
  &lt;android.support.v7.widget.CardView
      xmlns:card_view="http://schemas.android.com/apk/res-auto"
      android:id="@+id/card_view"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      app:cardBackgroundColor="@android:color/white"
      android:foreground="?android:attr/selectableItemBackground"
      app:cardCornerRadius="4dp"
      app:cardElevation="4dp" &gt;
  
      &lt;RelativeLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:paddingBottom="@dimen/activity_vertical_margin"
          android:paddingTop="@dimen/activity_vertical_margin" &gt;
  
          &lt;TextView
              android:id="@+id/tvName"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentTop="true"
              android:layout_marginTop="@dimen/padding_small"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:textAppearance="?android:attr/textAppearanceLarge" /&gt;
  
          &lt;ImageView
              android:id="@+id/ivPicture"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_below="@+id/tvName"
              android:layout_centerHorizontal="true"
              android:scaleType="fitCenter" /&gt;
  
          &lt;TextView
              android:id="@+id/tvDetail"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_below="@+id/ivPicture"
              android:layout_centerHorizontal="true"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin" /&gt;
      &lt;/RelativeLayout&gt;
  &lt;/android.support.v7.widget.CardView&gt;
  </code></pre>
  
  <p></p>
  
  <p>And the ListView xml :</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:card_view="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:app="http://schemas.android.com/apk/res/com.example.myapp"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="@drawable/app_bg" &gt;
  
  &lt;ListView
      android:id="@android:id/list"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_alignParentTop="true"
      android:cacheColorHint="#00000000"
      android:divider="@android:color/transparent"
      android:drawSelectorOnTop="true"
      android:smoothScrollbar="true" /&gt;
  
  &lt;ProgressBar
      android:id="@+id/progressBarMain"
      style="?android:attr/progressBarStyleLarge"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:visibility="gone" /&gt;&lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>It works fine on pre-L devices with proper shadow and rounded corners. But not working aon Android L device. Can you tell what i am missing here?</p>