More over many of 8.0 inch tablets having the 1280 x 800 resolution. if you really want to know the exact resolution of your specific 8.0 inch tablet then simply you can get by using the following code
If you want the display dimensions in pixels you can use getSize:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
This method was introduced in Android API 13, so if you want to get display metrics for previous APIs use:
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int wwidth = displaymetrics.widthPixels;
on Android you can specify smallest width on the resources. Examples:
layout-sw600dp/ < that's a 7" like the Nexus 7
layout-sw720dp/ < that's a 10" like the Nexus 10
so all you have to do is to find out what's the smallest width in DP for the 8 inches (probably something around 660dp) and create the resource folder for it.
Refer this link. Here they explained in detail regarding the screen support
http://developer.samsung.com/technical-doc/view.do;jsessionid=P0nhJ0Jh1VJhPQklhN1G1vJYrH5JWH2PYnv5RsP5pWfSxY86fgpb!361558248?v=T000000126