The second Android 11 Developer Preview is now available, test it out and share your feedback.

com.google.android.material.snackbar

Interfaces

BaseTransientBottomBar.ContentViewCallback This interface is deprecated. Use ContentViewCallback instead.  
ContentViewCallback Interface that defines the behavior of the main content of a transient bottom bar. 

Classes

BaseTransientBottomBar<B extends BaseTransientBottomBar<B>> Base class for lightweight transient bars that are displayed along the bottom edge of the application window. 
BaseTransientBottomBar.BaseCallback<B> Base class for BaseTransientBottomBar callbacks. 
BaseTransientBottomBar.Behavior Behavior for BaseTransientBottomBar
Snackbar Snackbars provide lightweight feedback about an operation. 
Snackbar.Callback Callback class for Snackbar instances.