SparseArrayObjectAdapter

Kotlin |Java

public class SparseArrayObjectAdapter extends ObjectAdapter

java.lang.Object
↳	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 methods
`void`	`clear()` Removes all items from this adapter, leaving it empty.
`void`	`clear(int key)` Clears the given key and associated item from the adapter.
`Object`	`get(int position)` Returns the item for the given position.
`int`	`indexOf(Object item)` Returns the index for the given item in the adapter.
`int`	`indexOf(int key)` 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.
`Object`	`lookup(int key)` Returns the object for the given key, or null if no mapping for that key exists.
`void`	`notifyArrayItemRangeChanged(int positionStart, int itemCount)` Notify that the content of a range of items changed.
`void`	`set(int key, Object item)` Sets the item for the given key.
`int`	`size()` Returns the number of items in the adapter.

Inherited Constants

From androidx.leanback.widget.ObjectAdapter

static final int

NO_ID = -1

Indicates that an id has not been set.

Inherited methods

From androidx.leanback.widget.ObjectAdapter

`long`	`getId(int position)` Returns the id for the given position.
`final Presenter`	`getPresenter(Object item)` Returns the `Presenter` for the given item from the adapter.
`final PresenterSelector`	`getPresenterSelector()` Returns the presenter selector for this ObjectAdapter.
`final boolean`	`hasStableIds()` Returns true if the item ids are stable across changes to the underlying data.
`final void`	`notifyChanged()` Notifies UI that the underlying data has changed.
`final void`	`notifyItemMoved(int fromPosition, int toPosition)` Notifies UI that item at fromPosition has been moved to toPosition.
`final void`	`notifyItemRangeChanged(int positionStart, int itemCount)` Notifies UI that some items has changed.
`final void`	`notifyItemRangeChanged(int positionStart, int itemCount, Object payload)` Notifies UI that some items has changed.
`final void`	`notifyItemRangeInserted(int positionStart, int itemCount)` Notifies UI that new items has been inserted.
`final void`	`notifyItemRangeRemoved(int positionStart, int itemCount)` Notifies UI that some items that has been removed.
`void`	`onHasStableIdsChanged()` Called when `setHasStableIds` is called and the status of stable ids has changed.
`void`	`onPresenterSelectorChanged()` Called when `setPresenterSelector` is called and the PresenterSelector differs from the previous one.
`final void`	`registerObserver(ObjectAdapter.DataObserver observer)` Registers a DataObserver for data change notifications.
`final void`	`setHasStableIds(boolean hasStableIds)` Sets whether the item ids are stable across changes to the underlying data.
`final void`	`setPresenterSelector(PresenterSelector presenterSelector)` Sets the presenter selector.
`final void`	`unregisterAllObservers()` Unregisters all DataObservers for this ObjectAdapter.
`final void`	`unregisterObserver(ObjectAdapter.DataObserver observer)` Unregisters a DataObserver for data change notifications.

Public constructors

SparseArrayObjectAdapter

public SparseArrayObjectAdapter()

Constructs an adapter.

public SparseArrayObjectAdapter(Presenter presenter)

Constructs an adapter with the given Presenter.

public SparseArrayObjectAdapter(PresenterSelector presenterSelector)

Constructs an adapter with the given PresenterSelector.

Public methods

clear

public void clear()

Removes all items from this adapter, leaving it empty.

clear

public void clear(int key)

Clears the given key and associated item from the adapter.

Parameters
`int key`	The key to be cleared.

get

public Object get(int position)

Returns the item for the given position.

indexOf

public int indexOf(Object item)

Returns the index for the given item in the adapter.

Parameters
`Object item`	The item to find in the array.

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

indexOf

public int indexOf(int key)

Returns the index for the given key in the adapter.

Parameters
`int key`	The key to find in the array.

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

isImmediateNotifySupported

public boolean isImmediateNotifySupported()

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

lookup

public Object lookup(int key)

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

notifyArrayItemRangeChanged

public void notifyArrayItemRangeChanged(int positionStart, int itemCount)

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

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

set

public void set(int key, Object item)

Sets the item for the given key.

Parameters
`int key`	The key associated with the item.
`Object item`	The item associated with the key.

size

public int size()

Returns the number of items in the adapter.