
public abstract class RecyclerView.AdapterDataObserver

Observer base class for watching changes to an Adapter.See registerAdapterDataObserver.

Modifier and Type	Method	Description
`void`	`onChanged()`
`void`	`onItemRangeChanged(int positionStart, int itemCount)`
`void`	`onItemRangeChanged(int positionStart, int itemCount, @Nullable() Object payload)`
`void`	`onItemRangeInserted(int positionStart, int itemCount)`
`void`	`onItemRangeRemoved(int positionStart, int itemCount)`
`void`	`onItemRangeMoved(int fromPosition, int toPosition, int itemCount)`
`void`	`onStateRestorationPolicyChanged()`	Called when the Adapter.StateRestorationPolicy of the Adapter changed.When this method is called, the Adapter might be ready to restore its state if it hasnot already been restored.

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

 void onItemRangeChanged(int positionStart, int itemCount)

 void onItemRangeChanged(int positionStart, int itemCount, @Nullable() Object payload)

 void onItemRangeInserted(int positionStart, int itemCount)

 void onItemRangeRemoved(int positionStart, int itemCount)

 void onItemRangeMoved(int fromPosition, int toPosition, int itemCount)

onStateRestorationPolicyChanged
```
 void onStateRestorationPolicyChanged()
```
Called when the Adapter.StateRestorationPolicy of the Adapter changed.When this method is called, the Adapter might be ready to restore its state if it hasnot already been restored.

Class RecyclerView.AdapterDataObserver