added in API level 28


Slice A slice is a piece of app content and actions that can be surfaced outside of the app. 
Slice.Builder A Builder used to construct Slices  
SliceItem A SliceItem is a single unit in the tree structure of a Slice
SliceManager Class to handle interactions with Slices. 
SliceMetrics Metrics interface for slices. 
SliceProvider A SliceProvider allows an app to provide content to be displayed in system spaces. 
SliceSpec Class describing the structure of the data contained within a slice.