It should be remembered that the use of the resource identifier swXXXdponly works on devices running Android 3.2+ (which has been added). Older devices will not recognize and therefore will not use these identifiers, so you have to use the old ID ( small, normal, large, xlarge), if you plan to support tablets running Android <3.2. Currently, only 0.3% of tablets launch Android 3.1 (API 12), so a secure call does not fully support them - http://developer.android.com/about/dashboards/index.html . p>
There is a great blog explaining how to use these new resource identifiers.
http://android-developers.blogspot.com/2011/07/new-tools-for-managing-screen-sizes.html
, , Android 3.2+ , layout-xlarge layout-sw720dp 10 "+ , layout-sw600dp 7" .