ObjectAdapter

Kotlin |Java

abstract class ObjectAdapter

kotlin.Any
↳	androidx.leanback.widget.ObjectAdapter

Known Direct Subclasses

ArrayObjectAdapter, CursorObjectAdapter, PagingDataAdapter, SparseArrayObjectAdapter

ArrayObjectAdapter	An `ObjectAdapter` implemented with an `ArrayList`.
CursorObjectAdapter	An `ObjectAdapter` implemented with a `Cursor`.
PagingDataAdapter	An ObjectAdapter implemented with an AsyncPagingDataDiffer.
SparseArrayObjectAdapter	An `ObjectAdapter` implemented with a `android.util.SparseArray`.

Base class adapter to be used in leanback activities. Provides access to a data model and is decoupled from the presentation of the items via PresenterSelector.

Summary

Nested classes
abstract	`DataObserver` A DataObserver can be notified when an ObjectAdapter's underlying data changes.

Constants
static Int	`NO_ID` Indicates that an id has not been set.

Public constructors
`<init>(presenterSelector: PresenterSelector!)` Constructs an adapter with the given `PresenterSelector`.
`<init>(presenter: Presenter!)` Constructs an adapter that uses the given `Presenter` for all items.
`<init>()` Constructs an adapter.

Public methods
abstract Any!	`get(position: Int)` Returns the item for the given position.
open Long	`getId(position: Int)` Returns the id for the given position.
Presenter!	`getPresenter(item: Any!)` Returns the `Presenter` for the given item from the adapter.
PresenterSelector!	`getPresenterSelector()` Returns the presenter selector for this ObjectAdapter.
Boolean	`hasStableIds()` Returns true if the item ids are stable across changes to the underlying data.
open Boolean	`isImmediateNotifySupported()` Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.
Unit	`notifyItemRangeChanged(positionStart: Int, itemCount: Int)` Notifies UI that some items has changed.
Unit	`notifyItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any!)` Notifies UI that some items has changed.
Unit	`registerObserver(observer: ObjectAdapter.DataObserver!)` Registers a DataObserver for data change notifications.
Unit	`setHasStableIds(hasStableIds: Boolean)` Sets whether the item ids are stable across changes to the underlying data.
Unit	`setPresenterSelector(presenterSelector: PresenterSelector!)` Sets the presenter selector.
abstract Int	`size()` Returns the number of items in the adapter.
Unit	`unregisterAllObservers()` Unregisters all DataObservers for this ObjectAdapter.
Unit	`unregisterObserver(observer: ObjectAdapter.DataObserver!)` Unregisters a DataObserver for data change notifications.

Protected methods
Unit	`notifyChanged()` Notifies UI that the underlying data has changed.
Unit	`notifyItemMoved(fromPosition: Int, toPosition: Int)` Notifies UI that item at fromPosition has been moved to toPosition.
Unit	`notifyItemRangeInserted(positionStart: Int, itemCount: Int)` Notifies UI that new items has been inserted.
Unit	`notifyItemRangeRemoved(positionStart: Int, itemCount: Int)` Notifies UI that some items that has been removed.
open Unit	`onHasStableIdsChanged()` Called when `setHasStableIds(boolean)` is called and the status of stable ids has changed.
open Unit