# DefaultItemAnimator
# DefaultItemAnimator
Artifact:[androidx.recyclerview:recyclerview](https://developer.android.com/jetpack/androidx/releases/recyclerview)
[View Source](https://cs.android.com/search?q=file:androidx/recyclerview/widget/DefaultItemAnimator.java+class:androidx.recyclerview.widget.DefaultItemAnimator)
Added in[1.0.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.0.0)
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/androidx/recyclerview/widget/DefaultItemAnimator "View this page in Java")
```
class DefaultItemAnimator : SimpleItemAnimator
```
|---|---|---|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) ||||
| ↳ | [androidx.recyclerview.widget.RecyclerView.ItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator) |||
| | ↳ | [androidx.recyclerview.widget.SimpleItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator) ||
| | | ↳ | [androidx.recyclerview.widget.DefaultItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator) |
*** ** * ** ***
This implementation of[RecyclerView.ItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator)provides basic animations on remove, add, and move events that happen to the items in a RecyclerView. RecyclerView uses a DefaultItemAnimator by default.
| See also |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| [setItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView#setItemAnimator(androidx.recyclerview.widget.RecyclerView.ItemAnimator)) | |
## Summary
| ### Public constructors |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| [DefaultItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#DefaultItemAnimator())`()` |
| ### Public functions |
|-------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateAdd](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateAdd(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(holder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when an item is added to the RecyclerView. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateChange](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateChange(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int,int))`(` ` oldHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!,` ` newHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!,` ` fromLeft: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` fromTop: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` toLeft: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` toTop: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) `)` Called when an item is changed in the RecyclerView, as indicated by a call to RecyclerView.Adapter#notifyItemChanged(int) or RecyclerView.Adapter#notifyItemRangeChanged(int, int). |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateMove](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateMove(androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int,int))`(` ` holder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!,` ` fromX: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` fromY: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` toX: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` toY: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) `)` Called when an item is moved in the RecyclerView. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateRemove](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateRemove(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(holder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when an item is removed from the RecyclerView. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [canReuseUpdatedViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#canReuseUpdatedViewHolder(androidx.recyclerview.widget.RecyclerView.ViewHolder,java.util.List))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` payloads: (`[Mutable](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)`)`[List](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html)`<`[Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`!>` `)` When an item is changed, ItemAnimator can decide whether it wants to re-use the same ViewHolder for animations or RecyclerView should create a copy of the item and ItemAnimator will use both to run the animation (e.g. cross-fade). |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [endAnimation](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#endAnimation(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method called when an animation on a view should be ended immediately. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [endAnimations](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#endAnimations())`()` Method called when all item animations should be ended immediately. |
| [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isRunning](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#isRunning())`()` Method which returns whether there are any item animations currently running. |
| [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [runPendingAnimations](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#runPendingAnimations())`()` Called when there are pending animations waiting to be started. |
| ### Inherited Constants |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From[androidx.recyclerview.widget.RecyclerView.ItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator) |-------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [FLAG_APPEARED_IN_PRE_LAYOUT](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#FLAG_APPEARED_IN_PRE_LAYOUT())` = 4096` This ViewHolder was not laid out but has been added to the layout in pre-layout state by the[LayoutManager](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.LayoutManager). | | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [FLAG_CHANGED](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#FLAG_CHANGED())` = 2` The Item represented by this ViewHolder is updated. | | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [FLAG_INVALIDATED](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#FLAG_INVALIDATED())` = 4` Adapter[notifyDataSetChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyDataSetChanged())has been called and the content represented by this ViewHolder is invalid. | | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [FLAG_MOVED](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#FLAG_MOVED())` = 2048` The position of the Item represented by this ViewHolder has been changed. | | `const `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html) | [FLAG_REMOVED](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#FLAG_REMOVED())` = 8` The Item represented by this ViewHolder is removed from the adapter. | |
| ### Inherited functions |
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| From[androidx.recyclerview.widget.RecyclerView.ItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator) |------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `abstract `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateAppearance](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#animateAppearance(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`?,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when a ViewHolder is added to the layout. | | `abstract `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateChange](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#animateChange(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` oldHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` newHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when an adapter item is present both before and after the layout and RecyclerView has received a[notifyItemChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int))call for it. | | `abstract `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateDisappearance](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#animateDisappearance(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`?` `)` Called by the RecyclerView when a ViewHolder has disappeared from the layout. | | `abstract `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animatePersistence](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#animatePersistence(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when a ViewHolder is present in both before and after the layout and RecyclerView has not received a[notifyItemChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int))call for it or a[notifyDataSetChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyDataSetChanged())call. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [canReuseUpdatedViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#canReuseUpdatedViewHolder(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` When an item is changed, ItemAnimator can decide whether it wants to re-use the same ViewHolder for animations or RecyclerView should create a copy of the item and ItemAnimator will use both to run the animation (e.g. cross-fade). | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchAnimationFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#dispatchAnimationFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Method to be called by subclasses when an animation is finished. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchAnimationStarted](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#dispatchAnimationStarted(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Method to be called by subclasses when an animation is started. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchAnimationsFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#dispatchAnimationsFinished())`()` This method should be called by ItemAnimator implementations to notify any listeners that all pending and active item animations are finished. | | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getAddDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#getAddDuration())`()` Gets the current duration for which all add animations will run. | | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getChangeDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#getChangeDuration())`()` Gets the current duration for which all change animations will run. | | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getMoveDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#getMoveDuration())`()` Gets the current duration for which all move animations will run. | | [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html) | [getRemoveDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#getRemoveDuration())`()` Gets the current duration for which all remove animations will run. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [isRunning](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#isRunning(androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemAnimatorFinishedListener))`(` ` listener: `[RecyclerView.ItemAnimator.ItemAnimatorFinishedListener](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemAnimatorFinishedListener)`?` `)` Like[isRunning](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#isRunning()), this method returns whether there are any item animations currently running. | | [RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) | [obtainHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#obtainHolderInfo())`()` Returns a new[ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)which will be used to store information about the ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onAnimationFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#onAnimationFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Called after[dispatchAnimationFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#dispatchAnimationFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))is called by the ItemAnimator. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onAnimationStarted](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#onAnimationStarted(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` Called when a new animation is started on the given ViewHolder. | | [RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) | [recordPostLayoutInformation](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#recordPostLayoutInformation(androidx.recyclerview.widget.RecyclerView.State,androidx.recyclerview.widget.RecyclerView.ViewHolder))`(` ` state: `[RecyclerView.State](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.State)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder) `)` Called by the RecyclerView after the layout is complete. | | [RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) | [recordPreLayoutInformation](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#recordPreLayoutInformation(androidx.recyclerview.widget.RecyclerView.State,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,java.util.List))`(` ` state: `[RecyclerView.State](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.State)`,` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` @`[RecyclerView.ItemAnimator.AdapterChanges](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.AdapterChanges)` changeFlags: `[Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`,` ` payloads: (`[Mutable](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)`)`[List](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html)`<`[Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html)`!>` `)` Called by the RecyclerView before the layout begins. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setAddDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#setAddDuration(long))`(addDuration: `[Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`)` Sets the duration for which all add animations will run. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setChangeDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#setChangeDuration(long))`(changeDuration: `[Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`)` Sets the duration for which all change animations will run. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setMoveDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#setMoveDuration(long))`(moveDuration: `[Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`)` Sets the duration for which all move animations will run. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setRemoveDuration](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator#setRemoveDuration(long))`(removeDuration: `[Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`)` Sets the duration for which all remove animations will run. | |
| From[androidx.recyclerview.widget.SimpleItemAnimator](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator) |-------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateAppearance](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#animateAppearance(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`?,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when a ViewHolder is added to the layout. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateChange](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#animateChange(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` oldHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` newHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when an adapter item is present both before and after the layout and RecyclerView has received a[notifyItemChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int))call for it. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animateDisappearance](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#animateDisappearance(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`?` `)` Called by the RecyclerView when a ViewHolder has disappeared from the layout. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [animatePersistence](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#animatePersistence(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo,androidx.recyclerview.widget.RecyclerView.ItemAnimator.ItemHolderInfo))`(` ` viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`,` ` preLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo)`,` ` postLayoutInfo: `[RecyclerView.ItemAnimator.ItemHolderInfo](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ItemAnimator.ItemHolderInfo) `)` Called by the RecyclerView when a ViewHolder is present in both before and after the layout and RecyclerView has not received a[notifyItemChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyItemChanged(int))call for it or a[notifyDataSetChanged](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.Adapter#notifyDataSetChanged())call. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [canReuseUpdatedViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#canReuseUpdatedViewHolder(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(viewHolder: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`)` When an item is changed, ItemAnimator can decide whether it wants to re-use the same ViewHolder for animations or RecyclerView should create a copy of the item and ItemAnimator will use both to run the animation (e.g. cross-fade). | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchAddFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchAddFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when an add animation is done. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchAddStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchAddStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when an add animation is being started. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchChangeFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchChangeFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder,boolean))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!, oldItem: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Method to be called by subclasses when a change animation is done. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchChangeStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchChangeStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder,boolean))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!, oldItem: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Method to be called by subclasses when a change animation is being started. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchMoveFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchMoveFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when a move animation is done. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchMoveStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchMoveStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when a move animation is being started. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchRemoveFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchRemoveFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when a remove animation is done. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [dispatchRemoveStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#dispatchRemoveStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Method to be called by subclasses when a remove animation is being started. | | [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html) | [getSupportsChangeAnimations](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#getSupportsChangeAnimations())`()` Returns whether this ItemAnimator supports animations of change events. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onAddFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onAddFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when an add animation has ended on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onAddStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onAddStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when an add animation is being started on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onChangeFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onChangeFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder,boolean))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!, oldItem: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Called when a change animation has ended on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onChangeStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onChangeStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder,boolean))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!, oldItem: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Called when a change animation is being started on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onMoveFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onMoveFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when a move animation has ended on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onMoveStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onMoveStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when a move animation is being started on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onRemoveFinished](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onRemoveFinished(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when a remove animation has ended on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [onRemoveStarting](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#onRemoveStarting(androidx.recyclerview.widget.RecyclerView.ViewHolder))`(item: `[RecyclerView.ViewHolder](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView.ViewHolder)`!)` Called when a remove animation is being started on the given ViewHolder. | | [Unit](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html) | [setSupportsChangeAnimations](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/SimpleItemAnimator#setSupportsChangeAnimations(boolean))`(supportsChangeAnimations: `[Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`)` Sets whether this ItemAnimator supports animations of item change events. | |
## Public constructors
### DefaultItemAnimator
Added in 1.0.0
```
DefaultItemAnimator()
```
## Public functions
### animateAdd
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun animateAdd(holder: RecyclerView.ViewHolder!): Boolean
```
Called when an item is added to the RecyclerView. Implementors can choose whether and how to animate that change, but must always call #dispatchAddFinished(RecyclerView.ViewHolder) when done, either immediately (if no animation will occur) or after the animation actually finishes. The return value indicates whether an animation has been set up and whether the ItemAnimator's #runPendingAnimations() method should be called at the next opportunity. This mechanism allows ItemAnimator to set up individual animations as separate calls to #animateAdd(RecyclerView.ViewHolder) animateAdd(), #animateMove(RecyclerView.ViewHolder, int, int, int, int) animateMove(), #animateRemove(RecyclerView.ViewHolder) animateRemove(), and #animateChange(RecyclerView.ViewHolder, RecyclerView.ViewHolder, int, int, int, int) come in one by one, then start the animations together in the later call to #runPendingAnimations().
This method may also be called for appearing items which were already in the RecyclerView, but for which the system does not have enough information to animate them into view. In that case, the default animation for adding items is run on those items as well.
### animateChange
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun animateChange(
oldHolder: RecyclerView.ViewHolder!,
newHolder: RecyclerView.ViewHolder!,
fromLeft: Int,
fromTop: Int,
toLeft: Int,
toTop: Int
): Boolean
```
Called when an item is changed in the RecyclerView, as indicated by a call to RecyclerView.Adapter#notifyItemChanged(int) or RecyclerView.Adapter#notifyItemRangeChanged(int, int).
Implementers can choose whether and how to animate changes, but must always call #dispatchChangeFinished(RecyclerView.ViewHolder, boolean) for each non-null distinct ViewHolder, either immediately (if no animation will occur) or after the animation actually finishes. If the oldHolder} is the same ViewHolder as the newHolder}, you must call #dispatchChangeFinished(RecyclerView.ViewHolder, boolean) once and only once. In that case, the second parameter of dispatchChangeFinished} is ignored.
The return value indicates whether an animation has been set up and whether the ItemAnimator's #runPendingAnimations() method should be called at the next opportunity. This mechanism allows ItemAnimator to set up individual animations as separate calls to #animateAdd(RecyclerView.ViewHolder) animateAdd(), #animateMove(RecyclerView.ViewHolder, int, int, int, int) animateMove(), #animateRemove(RecyclerView.ViewHolder) animateRemove(), and #animateChange(RecyclerView.ViewHolder, RecyclerView.ViewHolder, int, int, int, int) come in one by one, then start the animations together in the later call to #runPendingAnimations().
### animateMove
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun animateMove(
holder: RecyclerView.ViewHolder!,
fromX: Int,
fromY: Int,
toX: Int,
toY: Int
): Boolean
```
Called when an item is moved in the RecyclerView. Implementors can choose whether and how to animate that change, but must always call #dispatchMoveFinished(RecyclerView.ViewHolder) when done, either immediately (if no animation will occur) or after the animation actually finishes. The return value indicates whether an animation has been set up and whether the ItemAnimator's #runPendingAnimations() method should be called at the next opportunity. This mechanism allows ItemAnimator to set up individual animations as separate calls to #animateAdd(RecyclerView.ViewHolder) animateAdd(), #animateMove(RecyclerView.ViewHolder, int, int, int, int) animateMove(), #animateRemove(RecyclerView.ViewHolder) animateRemove(), and #animateChange(RecyclerView.ViewHolder, RecyclerView.ViewHolder, int, int, int, int) come in one by one, then start the animations together in the later call to #runPendingAnimations().
### animateRemove
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun animateRemove(holder: RecyclerView.ViewHolder!): Boolean
```
Called when an item is removed from the RecyclerView. Implementors can choose whether and how to animate that change, but must always call #dispatchRemoveFinished(RecyclerView.ViewHolder) when done, either immediately (if no animation will occur) or after the animation actually finishes. The return value indicates whether an animation has been set up and whether the ItemAnimator's #runPendingAnimations() method should be called at the next opportunity. This mechanism allows ItemAnimator to set up individual animations as separate calls to #animateAdd(RecyclerView.ViewHolder) animateAdd(), #animateMove(RecyclerView.ViewHolder, int, int, int, int) animateMove(), #animateRemove(RecyclerView.ViewHolder) animateRemove(), and #animateChange(RecyclerView.ViewHolder, RecyclerView.ViewHolder, int, int, int, int) come in one by one, then start the animations together in the later call to #runPendingAnimations().
This method may also be called for disappearing items which continue to exist in the RecyclerView, but for which the system does not have enough information to animate them out of view. In that case, the default animation for removing items is run on those items as well.
### canReuseUpdatedViewHolder
```
fun canReuseUpdatedViewHolder(
viewHolder: RecyclerView.ViewHolder,
payloads: (Mutable)List
): Boolean
```
When an item is changed, ItemAnimator can decide whether it wants to re-use the same ViewHolder for animations or RecyclerView should create a copy of the item and ItemAnimator will use both to run the animation (e.g. cross-fade).
Note that this method will only be called if the still has the same type ( Adapter#getItemViewType(int)). Otherwise, ItemAnimator will always receive both s in the #animateChange(ViewHolder, ViewHolder, ItemHolderInfo, ItemHolderInfo) method.
If the payload list is not empty, DefaultItemAnimator returns`true`. When this is the case:
- If you override[animateChange](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateChange(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int,int)), both ViewHolder arguments will be the same instance.
- If you are not overriding[animateChange](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateChange(androidx.recyclerview.widget.RecyclerView.ViewHolder,androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int,int)), then DefaultItemAnimator will call[animateMove](https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DefaultItemAnimator#animateMove(androidx.recyclerview.widget.RecyclerView.ViewHolder,int,int,int,int))and run a move animation instead.
### endAnimation
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun endAnimation(item: RecyclerView.ViewHolder!): Unit
```
Method called when an animation on a view should be ended immediately. This could happen when other events, like scrolling, occur, so that animating views can be quickly put into their proper end locations. Implementations should ensure that any animations running on the item are canceled and affected properties are set to their end values. Also, #dispatchAnimationFinished(ViewHolder) should be called for each finished animation since the animations are effectively done when this method is called.
### endAnimations
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun endAnimations(): Unit
```
Method called when all item animations should be ended immediately. This could happen when other events, like scrolling, occur, so that animating views can be quickly put into their proper end locations. Implementations should ensure that any animations running on any items are canceled and affected properties are set to their end values. Also, #dispatchAnimationFinished(ViewHolder) should be called for each finished animation since the animations are effectively done when this method is called.
### isRunning
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun isRunning(): Boolean
```
Method which returns whether there are any item animations currently running. This method can be used to determine whether to delay other actions until animations end.
### runPendingAnimations
Added in[1.4.0](https://developer.android.com/jetpack/androidx/releases/recyclerview#1.4.0)
```
fun runPendingAnimations(): Unit
```
Called when there are pending animations waiting to be started. This state is governed by the return values from #animateAppearance(ViewHolder, ItemHolderInfo, ItemHolderInfo) animateAppearance(), #animateChange(ViewHolder, ViewHolder, ItemHolderInfo, ItemHolderInfo) animateChange() #animatePersistence(ViewHolder, ItemHolderInfo, ItemHolderInfo) animatePersistence(), and #animateDisappearance(ViewHolder, ItemHolderInfo, ItemHolderInfo) animateDisappearance(), which inform the RecyclerView that the ItemAnimator wants to be called later to start the associated animations. runPendingAnimations() will be scheduled to be run on the next frame.