countQuery
Counts the rows a content-provider query returns without exposing their contents.
Queries only the _id column so the collector learns a count (e.g. number of contacts) without reading actual records; any failure yields 0.
Privacy: returns only an aggregate count, never row data. The caller is responsible for having the permission the uri requires.
Return
Number of matching rows, or 0 on failure.
Parameters
context
Context providing the content resolver.
uri
Content URI to query.
selection
Optional SQL-style selection filter.