ldpi (Low Density Screen, 120 DPI), which has an icon size of 36 x 36 px.
mdpi (Medium Density Screen, 160 DPI), its icon size is 48 x 48 px.
hdpi (High Density Screen, 240 DPI), its icon size is 72 x 72 px.
xdpi (Extra-high density screen, 320 DPI), its icon size is 96 x 96 px.
xxdpi (xx-high density screen, 480 DPI), its icon size is 144 x 144 px.
xxxdpi ( xxx-high density screen, 640 DPI ), its icon size is 192 x 192 px