title: CardView has extra margin in each edge on Pre-Lollipop
body: <p>Here are two pictures.</p>
  
  <p>on Lollipop:
  <img src="https://i.stack.imgur.com/PjIxs.jpg" alt="on Lollipop:"></p>
  
  <p>on Pre-Lollipop:
  <img src="https://i.stack.imgur.com/Y0Rh4.jpg" alt="on Pre-Lollipop"></p>
  
  <p>we can see that it's just close to the screen side on Lollipop. that's what I want. but on the Pre-Lollipop device, it has extra margin to the screen edge. do you guys have any experience ? thank you.</p>
  
  <p>here is the layout xml:</p>
  
  <pre><code>&lt;android.support.v7.widget.CardView
          android:id="@+id/card_title_schedule"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignParentTop="true"
          android:layout_alignParentLeft="true"
          android:layout_alignParentStart="true"
          android:layout_centerVertical="true"
          app:cardCornerRadius="0dp"
          app:cardBackgroundColor="@color/colorAccent"
          &gt;
  </code></pre>