When set to true, the list will use a more refined calculation method based on the pixels height of the items visible on screen. This property is set to true by default but should be set to false if your adapter will display items of varying heights. When this property is set to true and your adapter displays items of varying heights, the scrollbar thumb will change size as the user scrolls through the list. When set to fale, the list will use only the number of items in the adapter and the number of items visible on screen to determine the scrollbar's properties.

Must be a boolean value, either "true" or "false".

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]