Why there is no space between CardViews on Lollipop?
Set this on a CardView:
app:cardUseCompatPadding="true"
From documentation:
Add padding in API v21+ as well to have the same measurements with previous versions.
Use this two tags below inside of your cardview:
app:cardPreventCornerOverlap="false"
app:cardUseCompatPadding="true"