developing for android

http://developer.android.com/guide/practices/screens_support.html
The website above discusses how to develop apps for the android mobile operating system.

android is slightly harder to design for as it is designed to run on a variety of different devices at different resolutions.

Low density (120), ldpi Medium density (160), mdpi High density (240), hdpi
Small screen
QVGA (240x320), 2.6"-3.0" diagonal
Normal screen
WQVGA (240x400), 3.2"-3.5" diagonal
FWQVGA (240x432), 3.5"-3.8" diagonal
HVGA (320x480), 3.0"-3.5" diagonal
WVGA (480x800), 3.3"-4.0" diagonal
FWVGA (480x854), 3.5"-4.0" diagonal
Large screen
WVGA (480x800), 4.8"-5.5" diagonal
FWVGA (480x854), 5.0"-5.8" diagonal