Starting with Android.OS.Build.VERSION_CODES.HoneycombMr2, this is the new way to specify the screens an application is compatible with. This attribute provides the maximum "smallest screen width" (as per the -swNNNdp resource configuration) that the application can work well on. If this value is smaller than the "smallest screen width" of the device it is running on, the application will be forced in to screen compatibility mode with no way for the user to turn it off. Currently the compatibility mode only emulates phone screens with a 320dp width, so compatibility mode is not applied if the value for largestWidthLimitDp is larger than 320.

Must be an integer value, such as "100".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

[Android Documentation]