Reset item tops and bottoms for StaggeredGridView

When the StaggeredGridView is going to display
a completely new set of data, offer a reset method
so item top and bottom information is cleared.

Fix NPE when adapter notifyDataSetChanged() is
called.

Bug: 6282841
Change-Id: If1aee80358e32420d2b3a0d4e48ede39002d650a
1 file changed
tree: fe15f4b00bb46ba32e811f80b29a56a8b6895556
  1. v13/
  2. v4/
  3. v7/
  4. volley/