title: dynamically change BackgroundColor of CardView
body: <p>It is written in documentation that the BackgroundColor of CardView can be set in XML with <code>card_view:cardBackgroundColor</code>. However, I cannot find a corresponding method to change the background dynamically.</p>
  
  <p>Using <code>mCardView.setBackgroundColor(Color.argb(75, 102,80,67));</code> will cause the CardView to lose the rounded corner and shadow.</p>