Thanks Megha, that worked perfectly.
However, the documentation for
ContentResolver.query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder)
reads:
  "Passing null for [projection] will return all columns", [which is
discouraged to prevent reading data from storage that isn't going to
be used.]

In my simple test above, passing null returns null instead of a
cursor. Isn't this a bug?
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