<resources> <!-- Default screen margins, per the Android Design guidelines. --> <dimen name="activity_horizontal_margin">16dp</dimen> <dimen name="activity_vertical_margin">16dp</dimen> <dimen name="nav_header_vertical_spacing">8dp</dimen> <dimen name="nav_header_height">176dp</dimen> <dimen name="fab_margin">16dp</dimen> </resources>