Cardview - white border around card

Question

I am using a cardview as the root of a custom view I am writing. I using the v7 support library. My XML looks like this:

Answer 1

I know it's a bit late, but for anyone having a similar problem:

I had the same issue: A white border was shown on pre-lollipop devices.

I solved it setting the cardPreventCornerOverlap to false on your XML.

Like this:

Hope this helps!