DiffCallback

Added in 1.1.0

Kotlin |Java

public abstract class DiffCallback<Value>

Known direct subclasses

GuidedActionDiffCallback

GuidedActionDiffCallback

DiffCallback used for GuidedActions, see setActionsDiffCallback.

Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in setItems method.

The setItems method will pass items from different lists to this callback in order to implement the DiffUtil.Callback it uses to compute differences between lists.

Parameters
`<Value>`	Type of items to compare.

Summary

Public constructors
`DiffCallback()`

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

Public constructors

DiffCallback

Added in 1.1.0

public DiffCallback()

Public methods

areContentsTheSame

Added in 1.1.0

public abstract boolean areContentsTheSame(@NonNull Value oldItem, @NonNull Value newItem)

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
`@NonNull Value oldItem`	The item in the old list.
`@NonNull Value newItem`	The item in the new list.

Returns
`boolean`	True if the contents of the items are the same or false if they are different.

See also
`areContentsTheSame`

areItemsTheSame

Added in 1.1.0

public abstract boolean areItemsTheSame(@NonNull Value oldItem, @NonNull Value newItem)

Called to decide whether two objects represent the same item.

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

Returns
`boolean`	True if the two items represent the same object or false if they are different.

See also
`areItemsTheSame`

getChangePayload

Added in 1.1.0

public @Nullable Object getChangePayload(@NonNull Value oldItem, @NonNull Value newItem)

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

See also
`getChangePayload`