SimpleItemAnimator

Kotlin |Java

abstract class SimpleItemAnimator : RecyclerView.ItemAnimator

kotlin.Any
↳	androidx.recyclerview.widget.RecyclerView.ItemAnimator
	↳	androidx.recyclerview.widget.SimpleItemAnimator

Known Direct Subclasses DefaultItemAnimator DefaultItemAnimator This implementation of RecyclerView.ItemAnimator provides basic animations on remove, add, and move events that happen to the items in a RecyclerView.

A wrapper class for ItemAnimator that records View bounds and decides whether it should run move, change, add or remove animations. This class also replicates the original ItemAnimator API.

It uses RecyclerView.ItemAnimator.ItemHolderInfo to track the bounds information of the Views. If you would like to extend this class, you can override obtainHolderInfo() method to provide your own info class that extends RecyclerView.ItemAnimator.ItemHolderInfo.

Summary

Inherited constants

From class ItemAnimator Int FLAG_APPEARED_IN_PRE_LAYOUT This ViewHolder was not laid out but has been added to the layout in pre-layout state by the LayoutManager. This means that the item was already in the Adapter but invisible and it may become visible in the post layout phase. LayoutManagers may prefer to add new items in pre-layout to specify their virtual location when they are invisible (e.g. to specify the item should animate in from below the visible area). Int FLAG_CHANGED The Item represented by this ViewHolder is updated. Int FLAG_INVALIDATED Adapter Adapter#notifyDataSetChanged() has been called and the content represented by this ViewHolder is invalid. Int FLAG_MOVED The position of the Item represented by this ViewHolder has been changed. This flag is not bound to Adapter#notifyItemMoved(int, int). It might be set in response to any adapter change that may have a side effect on this item. (e.g. The item before this one has been removed from the Adapter). Int FLAG_REMOVED The Item represented by this ViewHolder is removed from the adapter.

Public constructors
<init>() A wrapper class for ItemAnimator that records View bounds and decides whether it should run move, change, add or remove animations.

Public methods
abstract Boolean	animateAdd(holder: RecyclerView.ViewHolder!) Called when an item is added to the RecyclerView.
open Boolean	animateAppearance(@NonNull viewHolder: RecyclerView.ViewHolder, @Nullable preLayoutInfo: RecyclerView.ItemAnimator.ItemHolderInfo?, @NonNull postLayoutInfo: RecyclerView.ItemAnimator.ItemHolderInfo)
open Boolean	animateChange(@NonNull oldHolder: RecyclerView.ViewHolder, @NonNull newHolder: RecyclerView.ViewHolder, @NonNull preInfo: RecyclerView.ItemAnimator.ItemHolderInfo, @NonNull postInfo: RecyclerView.ItemAnimator.ItemHolderInfo)
abstract Boolean	animateChange(oldHolder: RecyclerView.ViewHolder!, newHolder: RecyclerView.ViewHolder!, fromLeft: Int, fromTop: Int, toLeft: Int, toTop: Int) 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).
open Boolean	animateDisappearance(@NonNull viewHolder: RecyclerView.ViewHolder, @NonNull preLayoutInfo: RecyclerView.ItemAnimator.ItemHolderInfo, @Nullable postLayoutInfo: RecyclerView.ItemAnimator.ItemHolderInfo?)
abstract Boolean	animateMove(holder: RecyclerView.ViewHolder!, fromX: Int, fromY: Int