OnScrollListener unspecified API

```
public abstract class RecyclerView.OnScrollListener

                    
```
An OnScrollListener can be added to a RecyclerView to receive messages when a scrolling eventhas occurred on that RecyclerView.

Method Summary

Modifier and Type	Method	Description
`void`	`onScrollStateChanged(@NonNull() RecyclerView recyclerView, int newState)`	Callback method to be invoked when RecyclerView's scroll state changes.
`void`	`onScrolled(@NonNull() RecyclerView recyclerView, int dx, int dy)`	Callback method to be invoked when the RecyclerView has been scrolled.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onScrollStateChanged
```
 void onScrollStateChanged(@NonNull() RecyclerView recyclerView, int newState)
```
    Callback method to be invoked when RecyclerView's scroll state changes.
    
    Parameters:
    
    recyclerView - The RecyclerView whose scroll state has changed.
    
    newState - The updated scroll state.
  - onScrolled
```
 void onScrolled(@NonNull() RecyclerView recyclerView, int dx, int dy)
```
    Callback method to be invoked when the RecyclerView has been scrolled. This will becalled after the scroll has completed.
    This callback will also be called if visible item range changes after a layoutcalculation. In that case, dx and dy will be 0.
    
    Parameters:
    
    recyclerView - The RecyclerView which scrolled.
    
    dx - The amount of horizontal scroll.
    
    dy - The amount of vertical scroll.