CursorObjectAdapter

Kotlin |Java

public class CursorObjectAdapter extends ObjectAdapter

java.lang.Object
↳	androidx.leanback.widget.ObjectAdapter
	↳	androidx.leanback.widget.CursorObjectAdapter

An ObjectAdapter implemented with a Cursor.

Summary

Public constructors
`CursorObjectAdapter()` Constructs an adapter.
`CursorObjectAdapter(Presenter presenter)` Constructs an adapter that uses the given `Presenter` for all items.
`CursorObjectAdapter(PresenterSelector presenterSelector)` Constructs an adapter with the given `PresenterSelector`.

Public methods
`void`	`changeCursor(Cursor cursor)` Changes the underlying cursor to a new cursor.
`void`	`close()` Closes this adapter, closing the backing `Cursor` as well.
`Object`	`get(int index)` Returns the item for the given position.
`final Cursor`	`getCursor()` Returns the `Cursor` backing the adapter.
`final CursorMapper`	`getMapper()` Returns the `CursorMapper` used to convert `Cursor` rows into Objects.
`boolean`	`isClosed()` Returns true if the adapter, and hence the backing `Cursor`, is closed; false otherwise.
`boolean`	`isImmediateNotifySupported()` Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.
`final void`	`setMapper(CursorMapper mapper)` Sets the `CursorMapper` used to convert `Cursor` rows into Objects.
`int`	`size()` Returns the number of items in the adapter.
`Cursor`	`swapCursor(Cursor cursor)` Swap in a new Cursor, returning the old Cursor.

Protected methods
`final void`	`invalidateCache(int index)` Removes an item from the cache.
`final void`	`invalidateCache(int index, int count)` Removes `count` items starting at `index`.
`void`	`onCursorChanged()` Called whenever the cursor changes.
`void`	`onMapperChanged()` Called when `setMapper` is called and a different mapper is provided.

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

CursorObjectAdapter

public CursorObjectAdapter()

Constructs an adapter.

public CursorObjectAdapter(Presenter presenter)

Constructs an adapter that uses the given Presenter for all items.

public CursorObjectAdapter(PresenterSelector presenterSelector)

Constructs an adapter with the given PresenterSelector.

Public methods

changeCursor

public void changeCursor(Cursor cursor)

Changes the underlying cursor to a new cursor. If there is an existing cursor it will be closed if it is different than the new cursor.

Parameters
`Cursor cursor`	The new cursor to be used.

close

public void close()

Closes this adapter, closing the backing Cursor as well.

get

public Object get(int index)

Returns the item for the given position.

getCursor

public final Cursor getCursor()

Returns the Cursor backing the adapter.

getMapper

public final CursorMapper getMapper()

Returns the CursorMapper used to convert Cursor rows into Objects.

isClosed

public boolean isClosed()

Returns true if the adapter, and hence the backing Cursor, is closed; false otherwise.

isImmediateNotifySupported

public boolean isImmediateNotifySupported()

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

setMapper

public final void setMapper(CursorMapper mapper)

Sets the CursorMapper used to convert Cursor rows into Objects.

size

public int size()

Returns the number of items in the adapter.

swapCursor

public Cursor swapCursor(Cursor cursor)

Swap in a new Cursor, returning the old Cursor. Unlike changeCursor(Cursor), the returned old Cursor is not closed.

Parameters
`Cursor cursor`	The new cursor to be used.

Protected methods

invalidateCache

protected final void invalidateCache(int index)

Removes an item from the cache. This will force the item to be re-read from the data source the next time get is called.

invalidateCache

protected final void invalidateCache(int index, int count)

Removes count items starting at index.

onCursorChanged

protected void onCursorChanged()

Called whenever the cursor changes.

onMapperChanged

protected void onMapperChanged()

Called when setMapper is called and a different mapper is provided.