~240dpi 150% /drawable-xhdpi (extra-high) ~320dpi 200% /drawable-xxhdpi (extra-extra-high) ~480dpi 300% /drawable-xxxhdpi (extra-extra-extra-high) ~640dpi 400% /drawable/… 1MDPI* = 1px *The density-independent pixel is equivalent to one physical pixel on a 160 dpi screen, which is the baseline density assumed by the system for a “medium” density screen
an 8dp square baseline grid. Type aligns to a 4dp baseline grid. Iconography in toolbars align to a 4dp square baseline grid. This applies to mobile, tablet, and desktop. www.google.es/design/spec/layout/metrics-keylines.html