# CursorObjectAdapter
# CursorObjectAdapter
Artifact:[androidx.leanback:leanback](https://developer.android.com/jetpack/androidx/releases/leanback)
[View Source](https://cs.android.com/search?q=file:androidx/leanback/widget/CursorObjectAdapter.java+class:androidx.leanback.widget.CursorObjectAdapter)
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/androidx/leanback/widget/CursorObjectAdapter "View this page in Java")
```
class CursorObjectAdapter : ObjectAdapter
```
|---|---|---------------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) |||
| ↳ | [androidx.leanback.widget.ObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter) ||
| | ↳ | [androidx.leanback.widget.CursorObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter) |
*** ** * ** ***
An[ObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter)implemented with a[Cursor](https://developer.android.com/reference/android/database/Cursor.html).
## Summary
| ### Public constructors |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [CursorObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#CursorObjectAdapter())`()` Constructs an adapter. |
| [CursorObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#CursorObjectAdapter(androidx.leanback.widget.Presenter))`(presenter: `[Presenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/Presenter)`!)` Constructs an adapter that uses the given[Presenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/Presenter)for all items. |
| [CursorObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#CursorObjectAdapter(androidx.leanback.widget.PresenterSelector))`(presenterSelector: `[PresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/PresenterSelector)`!)` Constructs an adapter with the given[PresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/PresenterSelector). |
| ### Public functions |
|-----------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [changeCursor](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#changeCursor(android.database.Cursor))`(cursor: `[Cursor](https://developer.android.com/reference/android/database/Cursor.html)`!)` Changes the underlying cursor to a new cursor. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [close](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#close())`()` Closes this adapter, closing the backing[Cursor](https://developer.android.com/reference/android/database/Cursor.html)as well. |
| [Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`?` | [get](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#get(int))`(index: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Returns the item for the given position. |
| [Cursor](https://developer.android.com/reference/android/database/Cursor.html)`!` | [getCursor](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#getCursor())`()` Returns the[Cursor](https://developer.android.com/reference/android/database/Cursor.html)backing the adapter. |
| [CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)`!` | [getMapper](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#getMapper())`()` Returns the[CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)used to convert[Cursor](https://developer.android.com/reference/android/database/Cursor.html)rows into Objects. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isClosed](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#isClosed())`()` Returns true if the adapter, and hence the backing[Cursor](https://developer.android.com/reference/android/database/Cursor.html), is closed; false otherwise. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isImmediateNotifySupported](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#isImmediateNotifySupported())`()` Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setMapper](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#setMapper(androidx.leanback.database.CursorMapper))`(mapper: `[CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)`!)` Sets the[CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)used to convert[Cursor](https://developer.android.com/reference/android/database/Cursor.html)rows into Objects. |
| [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [size](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#size())`()` Returns the number of items in the adapter. |
| [Cursor](https://developer.android.com/reference/android/database/Cursor.html)`!` | [swapCursor](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#swapCursor(android.database.Cursor))`(cursor: `[Cursor](https://developer.android.com/reference/android/database/Cursor.html)`!)` Swap in a new Cursor, returning the old Cursor. |
| ### Protected functions |
|-------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [invalidateCache](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#invalidateCache(int))`(index: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Removes an item from the cache. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [invalidateCache](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#invalidateCache(int,int))`(index: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, count: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Removes`count`items starting at`index`. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onCursorChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#onCursorChanged())`()` Called whenever the cursor changes. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onMapperChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#onMapperChanged())`()` Called when[setMapper](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#setMapper(androidx.leanback.database.CursorMapper))is called and a different mapper is provided. |
| ### Inherited Constants |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From[androidx.leanback.widget.ObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter) |-------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------| | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [NO_ID](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#NO_ID())` = -1` Indicates that an id has not been set. | |
| ### Inherited functions |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From[androidx.leanback.widget.ObjectAdapter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter) |----------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getId](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#getId(int))`(position: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Returns the id for the given position. | | [Presenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/Presenter)`?` | [getPresenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#getPresenter(java.lang.Object))`(item: `[Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`)` Returns the[Presenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/Presenter)for the given item from the adapter. | | [PresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/PresenterSelector) | [getPresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#getPresenterSelector())`()` Returns the presenter selector for this ObjectAdapter. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [hasStableIds](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#hasStableIds())`()` Returns true if the item ids are stable across changes to the underlying data. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyChanged())`()` Notifies UI that the underlying data has changed. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyItemMoved](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyItemMoved(int,int))`(fromPosition: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, toPosition: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Notifies UI that item at fromPosition has been moved to toPosition. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyItemRangeChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyItemRangeChanged(int,int))`(positionStart: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, itemCount: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Notifies UI that some items has changed. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyItemRangeChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyItemRangeChanged(int,int,java.lang.Object))`(positionStart: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, itemCount: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, payload: `[Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`?)` Notifies UI that some items has changed. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyItemRangeInserted](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyItemRangeInserted(int,int))`(positionStart: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, itemCount: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Notifies UI that new items has been inserted. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [notifyItemRangeRemoved](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#notifyItemRangeRemoved(int,int))`(positionStart: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`, itemCount: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`)` Notifies UI that some items that has been removed. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onHasStableIdsChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#onHasStableIdsChanged())`()` Called when[setHasStableIds](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#setHasStableIds(boolean))is called and the status of stable ids has changed. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onPresenterSelectorChanged](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#onPresenterSelectorChanged())`()` Called when[setPresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#setPresenterSelector(androidx.leanback.widget.PresenterSelector))is called and the PresenterSelector differs from the previous one. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [registerObserver](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#registerObserver(androidx.leanback.widget.ObjectAdapter.DataObserver))`(observer: `[ObjectAdapter.DataObserver](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter.DataObserver)`)` Registers a DataObserver for data change notifications. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setHasStableIds](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#setHasStableIds(boolean))`(hasStableIds: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Sets whether the item ids are stable across changes to the underlying data. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setPresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#setPresenterSelector(androidx.leanback.widget.PresenterSelector))`(presenterSelector: `[PresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/PresenterSelector)`)` Sets the presenter selector. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [unregisterAllObservers](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#unregisterAllObservers())`()` Unregisters all DataObservers for this ObjectAdapter. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [unregisterObserver](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter#unregisterObserver(androidx.leanback.widget.ObjectAdapter.DataObserver))`(observer: `[ObjectAdapter.DataObserver](https://developer.android.com/reference/kotlin/androidx/leanback/widget/ObjectAdapter.DataObserver)`)` Unregisters a DataObserver for data change notifications. | |
## Public constructors
### CursorObjectAdapter
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
CursorObjectAdapter()
```
Constructs an adapter.
### CursorObjectAdapter
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
CursorObjectAdapter(presenter: Presenter!)
```
Constructs an adapter that uses the given[Presenter](https://developer.android.com/reference/kotlin/androidx/leanback/widget/Presenter)for all items.
### CursorObjectAdapter
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
CursorObjectAdapter(presenterSelector: PresenterSelector!)
```
Constructs an adapter with the given[PresenterSelector](https://developer.android.com/reference/kotlin/androidx/leanback/widget/PresenterSelector).
## Public functions
### changeCursor
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun changeCursor(cursor: Cursor!): Unit
```
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](https://developer.android.com/reference/android/database/Cursor.html)`!` | The new cursor to be used. |
### close
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun close(): Unit
```
Closes this adapter, closing the backing[Cursor](https://developer.android.com/reference/android/database/Cursor.html)as well.
### get
```
fun get(index: Int): Any?
```
Returns the item for the given position.
### getCursor
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun getCursor(): Cursor!
```
Returns the[Cursor](https://developer.android.com/reference/android/database/Cursor.html)backing the adapter.
### getMapper
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun getMapper(): CursorMapper!
```
Returns the[CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)used to convert[Cursor](https://developer.android.com/reference/android/database/Cursor.html)rows into Objects.
### isClosed
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun isClosed(): Boolean
```
Returns true if the adapter, and hence the backing[Cursor](https://developer.android.com/reference/android/database/Cursor.html), is closed; false otherwise.
### isImmediateNotifySupported
```
fun isImmediateNotifySupported(): Boolean
```
Returns true if the adapter pairs each underlying data change with a call to notify and false otherwise.
### setMapper
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun setMapper(mapper: CursorMapper!): Unit
```
Sets the[CursorMapper](https://developer.android.com/reference/kotlin/androidx/leanback/database/CursorMapper)used to convert[Cursor](https://developer.android.com/reference/android/database/Cursor.html)rows into Objects.
### size
```
fun size(): Int
```
Returns the number of items in the adapter.
### swapCursor
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
fun swapCursor(cursor: Cursor!): Cursor!
```
Swap in a new Cursor, returning the old Cursor. Unlike changeCursor(Cursor), the returned old Cursor is not closed.
| Parameters |
|---------------------------------------------------------------------------------------------|----------------------------|
| `cursor: `[Cursor](https://developer.android.com/reference/android/database/Cursor.html)`!` | The new cursor to be used. |
## Protected functions
### invalidateCache
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
protected fun invalidateCache(index: Int): Unit
```
Removes an item from the cache. This will force the item to be re-read from the data source the next time[get](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#get(int))is called.
### invalidateCache
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
protected fun invalidateCache(index: Int, count: Int): Unit
```
Removes`count`items starting at`index`.
### onCursorChanged
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
protected fun onCursorChanged(): Unit
```
Called whenever the cursor changes.
### onMapperChanged
Added in[1.1.0](https://developer.android.com/jetpack/androidx/releases/leanback#1.1.0)
```
protected fun onMapperChanged(): Unit
```
Called when[setMapper](https://developer.android.com/reference/kotlin/androidx/leanback/widget/CursorObjectAdapter#setMapper(androidx.leanback.database.CursorMapper))is called and a different mapper is provided.