SparseArrayObjectAdapter

Added in 1.1.0

Kotlin |Java

class SparseArrayObjectAdapter : ObjectAdapter

kotlin.Any
↳	androidx.leanback.widget.ObjectAdapter
	↳	androidx.leanback.widget.SparseArrayObjectAdapter

An ObjectAdapter implemented with a android.util.SparseArray. This class maintains an array of objects where each object is associated with an integer key which determines its order relative to other objects.

Summary

Public constructors
`SparseArrayObjectAdapter()` Constructs an adapter.
`SparseArrayObjectAdapter(presenter: Presenter!)` Constructs an adapter with the given `Presenter`.
`SparseArrayObjectAdapter(presenterSelector: PresenterSelector!)` Constructs an adapter with the given `PresenterSelector`.

Public functions
`Unit`	`clear()` Removes all items from this adapter, leaving it empty.
`Unit`	`clear(key: Int)` Clears the given key and associated item from the adapter.
`Any?`	`get(position: Int)` Returns the item for the given position.
`Int`	`indexOf(item: Any!)` Returns the index for the given item in the adapter.
`Int`	`indexOf(key: Int)` Returns the index for the given key in the adapter.
`Boolean`	`isImmediateNotifySupported()` Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.
`Any!`	`lookup(key: Int)` Returns the object for the given key, or null if no mapping for that key exists.
`Unit`	`notifyArrayItemRangeChanged(positionStart: Int, itemCount: Int)` Notify that the content of a range of items changed.
`Unit`	`set(key: Int, item: Any!)` Sets the item for the given key.
`Int`	`size()` Returns the number of items in the adapter.

Inherited Constants

From androidx.leanback.widget.ObjectAdapter

const Int

NO_ID = -1

Indicates that an id has not been set.

Inherited functions

From androidx.leanback.widget.ObjectAdapter

`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.
`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`	`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`	`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.
`Unit`	`onHasStableIdsChanged()` Called when `setHasStableIds` is called and the status of stable ids has changed.
`Unit`	`onPresenterSelectorChanged()` Called when `setPresenterSelector` is called and the PresenterSelector differs from the previous one.
`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.
`Unit`	`unregisterAllObservers()` Unregisters all DataObservers for this ObjectAdapter.
`Unit`	`unregisterObserver(observer: ObjectAdapter.DataObserver)` Unregisters a DataObserver for data change notifications.

Public constructors

SparseArrayObjectAdapter

Added in 1.1.0

SparseArrayObjectAdapter()

Constructs an adapter.

Added in 1.1.0

SparseArrayObjectAdapter(presenter: Presenter!)

Constructs an adapter with the given Presenter.

Added in 1.1.0

SparseArrayObjectAdapter(presenterSelector: PresenterSelector!)

Constructs an adapter with the given PresenterSelector.

Public functions

clear

Added in 1.1.0

fun clear(): Unit

Removes all items from this adapter, leaving it empty.

clear

Added in 1.1.0

fun clear(key: Int): Unit

Clears the given key and associated item from the adapter.

Parameters
`key: Int`	The key to be cleared.

get

Added in 1.2.0-alpha04

fun get(position: Int): Any?

Returns the item for the given position.

indexOf

Added in 1.1.0

fun indexOf(item: Any!): Int

Returns the index for the given item in the adapter.

Parameters
`item: Any!`	The item to find in the array.

Returns
`Int`	Index of the item, or a negative value if not found.

indexOf

Added in 1.1.0

fun indexOf(key: Int): Int

Returns the index for the given key in the adapter.

Parameters
`key: Int`	The key to find in the array.

Returns
`Int`	Index of the item, or a negative value if not found.

isImmediateNotifySupported

fun isImmediateNotifySupported(): Boolean

Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.

lookup

Added in 1.1.0

fun lookup(key: Int): Any!

Returns the object for the given key, or null if no mapping for that key exists.

notifyArrayItemRangeChanged

Added in 1.1.0

fun notifyArrayItemRangeChanged(positionStart: Int, itemCount: Int): Unit

Notify that the content of a range of items changed. Note that this is not same as items being added or removed.

Parameters
`positionStart: Int`	The position of first item that has changed.
`itemCount: Int`	The count of how many items have changed.

set

Added in 1.1.0

fun set(key: Int, item: Any!): Unit

Sets the item for the given key.

Parameters
`key: Int`	The key associated with the item.
`item: Any!`	The item associated with the key.

size

Added in 1.2.0-alpha04

fun size(): Int

Returns the number of items in the adapter.