Add API to show the top and the bottom divider in a StaggeredGridLayoutManager

[fondesa]

What's the Android API to detect if the item of a StaggeredGridLayoutManager is shown in the first position or not?
Consider also the span count and the full span items.
E.g.

• item 0: not full span
• item 1: full span
• item 2: not full span

[LLQQHH]

we can not count when is on bottom if we use StaggeredGridLayoutManager ,you can try try