added in version 25.1.0
belongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1

Summary: Methods | [Expand All]

ListUpdateCallback

public interface ListUpdateCallback

android.support.v7.util.ListUpdateCallback

Known Indirect Subclasses

An interface that can receive Update operations that are applied to a list.

This class can be used together with DiffUtil to detect changes between two lists.

Summary

Public methods
`abstract void`	`onChanged(int position, int count, Object payload)` Called when `count` number of items are updated at the given position.
`abstract void`	`onInserted(int position, int count)` Called when `count` number of items are inserted at the given position.
`abstract void`	`onMoved(int fromPosition, int toPosition)` Called when an item changes its position in the list.
`abstract void`	`onRemoved(int position, int count)` Called when `count` number of items are removed from the given position.

void onChanged (int position, 
                int count, 
                Object payload)

Called when count number of items are updated at the given position.

Parameters
`position`	`int`: The position of the item which has been updated.
`count`	`int`: The number of items which has changed.
`payload`	`Object`

void onInserted (int position, 
                int count)

Called when count number of items are inserted at the given position.

Parameters
`position`	`int`: The position of the new item.
`count`	`int`: The number of items that have been added.

void onMoved (int fromPosition, 
                int toPosition)

Called when an item changes its position in the list.

Parameters
`fromPosition`	`int`: The previous position of the item before the move.
`toPosition`	`int`: The new position of the item.

void onRemoved (int position, 
                int count)

Called when count number of items are removed from the given position.

Parameters
`position`	`int`: The position of the item which has been removed.
`count`	`int`: The number of items which have been removed.