ListUpdateCallback

Kotlin |Java

interface ListUpdateCallback

Known Direct Subclasses

AdapterListUpdateCallback	ListUpdateCallback that dispatches update events to the given adapter.
BatchingListUpdateCallback	Wraps a `ListUpdateCallback` callback and batches operations that can be merged.
SortedList.Callback	The class that controls the behavior of the `SortedList`.

Known Indirect Subclasses

SortedList.BatchedCallback	A callback implementation that can batch notify events dispatched by the SortedList.
SortedListAdapterCallback	A `SortedList.Callback` implementation that can bind a `SortedList` to a `RecyclerView.Adapter`.

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 Unit	`onChanged(position: Int, count: Int, @Nullable payload: Any?)` Called when `count` number of items are updated at the given position.
abstract Unit	`onInserted(position: Int, count: Int)` Called when `count` number of items are inserted at the given position.
abstract Unit	`onMoved(fromPosition: Int, toPosition: Int)` Called when an item changes its position in the list.
abstract Unit	`onRemoved(position: Int, count: Int)` Called when `count` number of items are removed from the given position.

abstract fun onChanged(
    position: Int, 
    count: Int, 
    @Nullable payload: Any?
): Unit

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.

abstract fun onInserted(
    position: Int, 
    count: Int
): Unit

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.

abstract fun onMoved(
    fromPosition: Int, 
    toPosition: Int
): Unit

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.

abstract fun onRemoved(
    position: Int, 
    count: Int
): Unit

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.