added in version 24.1.0

android.support.v7.widget.helper

Interfaces

ItemTouchHelper.ViewDropHandler An interface which can be implemented by LayoutManager for better integration with ItemTouchHelper. 
ItemTouchUIUtil Utility class for ItemTouchHelper which handles item transformations for different API versions. 

Classes

ItemTouchHelper This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView. 
ItemTouchHelper.Callback This class is the contract between ItemTouchHelper and your application. 
ItemTouchHelper.SimpleCallback A simple wrapper to the default Callback which you can construct with drag and swipe directions and this class will handle the flag callbacks.