Change the background color of CardView programmatically
What you are looking for is:
CardView card = ...
card.setCardBackgroundColor(color);
In XML
card_view:cardBackgroundColor="@android:color/white"
Update: in XML
app:cardBackgroundColor="@android:color/white"
Use the property card_view:cardBackgroundColor:
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:layout_gravity="center"
card_view:cardCornerRadius="4dp"
android:layout_margin="10dp"
card_view:cardBackgroundColor="#fff"
>