DiffCallback

Kotlin |Java

abstract class DiffCallback<Value : Any!>

kotlin.Any
↳	androidx.leanback.widget.DiffCallback

Known Direct Subclasses

DiffCallback used for GuidedActions, see .

Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in ArrayObjectAdapter#setItems(List, * DiffCallback) method.

The ArrayObjectAdapter#setItems(List, * DiffCallback) method will pass items from different lists to this callback in order to implement the DiffUtil.Callback it uses to compute differences between lists.

Summary

Public constructors
`<init>()` Callback that informs `ArrayObjectAdapter` how to compute list updates when using `DiffUtil` in `ArrayObjectAdapter#setItems(List, * DiffCallback)` method.

Public methods
abstract Boolean	`areContentsTheSame(@NonNull oldItem: Value, @NonNull newItem: Value)` Called to decide whether two items have the same data.
abstract Boolean	`areItemsTheSame(@NonNull oldItem: Value, @NonNull newItem: Value)` Called to decide whether two objects represent the same item.
open Any!	`getChangePayload(@NonNull oldItem: Value, @NonNull newItem: Value)` Called to get a change payload between an old and new version of an item.

DiffCallback()

Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in ArrayObjectAdapter#setItems(List, * DiffCallback) method.

abstract fun areContentsTheSame(
    @NonNull oldItem: Value, 
    @NonNull newItem: Value
): Boolean

Called to decide whether two items have the same data. This information is used to detect if the contents of an item have changed.

Parameters
`oldItem`	Value: The item in the old list.
`newItem`	Value: The item in the new list.

Return
`Boolean`	True if the contents of the items are the same or false if they are different.

See Also

abstract fun areItemsTheSame(
    @NonNull oldItem: Value, 
    @NonNull newItem: Value
): Boolean

Called to decide whether two objects represent the same item.

Parameters
`oldItem`	Value: The item in the old list.
`newItem`	Value: The item in the new list.

Return
`Boolean`	True if the two items represent the same object or false if they are different.

See Also

open fun getChangePayload(
    @NonNull oldItem: Value, 
    @NonNull newItem: Value
): Any!

Called to get a change payload between an old and new version of an item.

See Also