Minimum screen resolution for Android devices

Question

Please, what is the device with the minimum screen resolution on the market?

Answer 1

The current minimum values for android compatibility have changed from those shown in the accepted answer. Minimum size for recent versions of Android is 426x320, except for devices defined as watches which must have at least 120dpi and a diagonal size of at least 1.1 inches. As watches are permitted to be square (which other devices are not), this means the lowest permissible resolution of a watch is 1.1/sqrt2 * 120 = 93x93. In reality, this would probably not work, as I doubt the system UI would function in that size.