Official Description: Library providing support for paging across content exposed via a ContentProvider. Use of this library allows a client to avoid expensive interprocess "cursor window swaps" on the UI thread.

CommonsWare’s Notes

Android 8.0 extended the ContentProvider API to support “paged queries”, akin to how REST-style Web services might allow clients to retreive results a page at a time. ContentPager is designed to help consume this sort of paged content.

Relatively few providers support paged queries, and as such there is very little information on ContentPager.