LDPI 426dp x 320dp ~120dpi
MDPI 470dp x 320dp ~160dpi
HDPI 640dp x 480dp ~240dpi
XDPI 960dp x 720dp ~320dpi
19px for LDPI (240×320 HTC Tattoo)
25px for MDPI (320×480 HTC Magic, G1) 160 dpi HVGA
38px for HDPI (480×800 Nexus One, G2) WVGA
84px for HDPI
678dp for HDPI