ObjectAdapter
abstract class ObjectAdapter
| kotlin.Any | |
| ↳ | androidx.leanback.widget.ObjectAdapter |
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 |
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| abstract |
A DataObserver can be notified when an ObjectAdapter's underlying data changes. |
Constants |
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| static Int |
Indicates that an id has not been set. |
Public constructors |
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<init>(presenterSelector: PresenterSelector!)Constructs an adapter with the given |
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Constructs an adapter that uses the given |
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<init>()Constructs an adapter. |
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Public methods |
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| abstract Any! |
Returns the item for the given position. |
| open Long |
Returns the id for the given position. |
| Presenter! |
getPresenter(item: Any!)Returns the |
| PresenterSelector! |
Returns the presenter selector for this ObjectAdapter. |
| Boolean |
Returns true if the item ids are stable across changes to the underlying data. |
| open Boolean |
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 |
Unregisters all DataObservers for this ObjectAdapter. |
| Unit |
unregisterObserver(observer: ObjectAdapter.DataObserver!)Unregisters a DataObserver for data change notifications. |
Protected methods |
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| Unit |
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 |
Called when |
| open Unit |
Called when |
Constants
Public constructors
<init>
ObjectAdapter(presenterSelector: PresenterSelector!)
Constructs an adapter with the given PresenterSelector.
<init>
ObjectAdapter(presenter: Presenter!)
Constructs an adapter that uses the given Presenter for all items.
<init>
ObjectAdapter()
Constructs an adapter.
Public methods
getPresenter
fun getPresenter(item: Any!): Presenter!
Returns the Presenter for the given item from the adapter.
getPresenterSelector
fun getPresenterSelector(): PresenterSelector!
Returns the presenter selector for this ObjectAdapter.
hasStableIds
fun hasStableIds(): Boolean
Returns true if the item ids are stable across changes to the underlying data. When this is true, clients of the ObjectAdapter can use getId(int) to correlate Objects across changes.
isImmediateNotifySupported
open fun isImmediateNotifySupported(): Boolean
Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.
notifyItemRangeChanged
fun notifyItemRangeChanged(positionStart: Int, itemCount: Int): Unit
Notifies UI that some items has changed.
| Parameters | |
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positionStart |
Int: Starting position of the changed items. |
itemCount |
Int: Total number of items that changed. |
notifyItemRangeChanged
fun notifyItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any!): Unit
Notifies UI that some items has changed.
| Parameters | |
|---|---|
positionStart |
Int: Starting position of the changed items. |
itemCount |
Int: Total number of items that changed. |
payload |
Int: Optional parameter, use null to identify a "full" update. |
registerObserver
fun registerObserver(observer: ObjectAdapter.DataObserver!): Unit
Registers a DataObserver for data change notifications.
setHasStableIds
fun setHasStableIds(hasStableIds: Boolean): Unit
Sets whether the item ids are stable across changes to the underlying data.
setPresenterSelector
fun setPresenterSelector(presenterSelector: PresenterSelector!): Unit
Sets the presenter selector. May not be null.
unregisterAllObservers
fun unregisterAllObservers(): Unit
Unregisters all DataObservers for this ObjectAdapter.
unregisterObserver
fun unregisterObserver(observer: ObjectAdapter.DataObserver!): Unit
Unregisters a DataObserver for data change notifications.
Protected methods
notifyItemMoved
protected fun notifyItemMoved(fromPosition: Int, toPosition: Int): Unit
Notifies UI that item at fromPosition has been moved to toPosition.
| Parameters | |
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fromPosition |
Int: Previous position of the item. |
toPosition |
Int: New position of the item. |
notifyItemRangeInserted
protected fun notifyItemRangeInserted(positionStart: Int, itemCount: Int): Unit
Notifies UI that new items has been inserted.
| Parameters | |
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positionStart |
Int: Position where new items has been inserted. |
itemCount |
Int: Count of the new items has been inserted. |
notifyItemRangeRemoved
protected fun notifyItemRangeRemoved(positionStart: Int, itemCount: Int): Unit
Notifies UI that some items that has been removed.
| Parameters | |
|---|---|
positionStart |
Int: Starting position of the removed items. |
itemCount |
Int: Total number of items that has been removed. |
onHasStableIdsChanged
protected open fun onHasStableIdsChanged(): Unit
Called when setHasStableIds(boolean) is called and the status of stable ids has changed.
onPresenterSelectorChanged
protected open fun onPresenterSelectorChanged(): Unit
Called when setPresenterSelector(PresenterSelector) is called and the PresenterSelector differs from the previous one.