download
Download the specified regions.
The operations will be scheduled and performed asynchronously. Use RegionInfoUpdateListener for the progress tracking.
Return
A Result containing either a set of scheduled RegionOperation or a MapUpdateError if the operation could not be scheduled. The error could be (but not limited to):
a region is already scheduled for download or removal.
none of the given regions is available for download.
Parameters
regionIds
The regions to download.
Throws
if NdsStore or RegionUpdater is closed.
if regions list is empty.
Note This API will cancel the ongoing automatic updates.