belongs to Maven artifact androidx.leanback:leanback:1.0.0-rc01
DiffCallback
public
abstract
class
DiffCallback
extends Object
| java.lang.Object | |
| ↳ | androidx.leanback.widget.DiffCallback<Value> |
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()
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Public methods | |
|---|---|
abstract
boolean
|
areContentsTheSame(Value oldItem, Value newItem)
Called to decide whether two items have the same data. |
abstract
boolean
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areItemsTheSame(Value oldItem, Value newItem)
Called to decide whether two objects represent the same item. |
Object
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getChangePayload(Value oldItem, Value newItem)
Called to get a change payload between an old and new version of an item. |
Inherited methods | |
|---|---|
Public constructors
Public methods
areContentsTheSame
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. |
areItemsTheSame
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. |
getChangePayload
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 |
|