Summary: Ctors | Methods | Inherited Methods

DiffCallback

Kotlin |Java

public abstract class DiffCallback
extends Object

java.lang.Object
↳	androidx.leanback.widget.DiffCallback<Value>

Known direct subclasses

GuidedActionDiffCallback DiffCallback used for GuidedActions, see GuidedStepSupportFragment.setActionsDiffCallback(DiffCallback).

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
`DiffCallback()`

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

From class


        
          java.lang.Object

public DiffCallback ()

public abstract boolean areContentsTheSame (Value oldItem, 
                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
`oldItem`	`Value`: The item in the old list.
`newItem`	`Value`: 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:

public abstract boolean areItemsTheSame (Value oldItem, 
                Value newItem)

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.

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

See also:

public Object getChangePayload (Value oldItem, 
                Value newItem)

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

Parameters
`oldItem`	`Value`
`newItem`	`Value`

Returns
`Object`

See also: