CardView has extra margin in each edge on Pre-Lollipop

Question

Here are two pictures.

on Lollipop:

on Pre-Lollipop:

Answer 1

just add this in your code for pre lollipop versions:

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
    {
        cardView.setMaxCardElevation(0f);
        cardView.setPreventCornerOverlap(false);
    }