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added in version 22.1.0
belongs to Maven artifact com.android.support:recyclerview-v7:28.0.0-alpha1

DefaultItemAnimator

public class DefaultItemAnimator
extends SimpleItemAnimator

java.lang.Object
   ↳ android.support.v7.widget.RecyclerView.ItemAnimator
     ↳ android.support.v7.widget.SimpleItemAnimator
       ↳ android.support.v7.widget.DefaultItemAnimator


This implementation of 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.

Summary

Inherited constants

From class android.support.v7.widget.RecyclerView.ItemAnimator

Public constructors

DefaultItemAnimator()

Public methods

boolean animateAdd(RecyclerView.ViewHolder holder)

Called when an item is added to the RecyclerView.

boolean animateChange(RecyclerView.ViewHolder oldHolder, RecyclerView.ViewHolder newHolder, int fromX, int fromY, int toX, int toY)

Called when an item is changed in the RecyclerView, as indicated by a call to notifyItemChanged(int) or notifyItemRangeChanged(int, int).

boolean animateMove(RecyclerView.ViewHolder holder, int fromX, int fromY, int toX, int toY)

Called when an item is moved in the RecyclerView.

boolean animateRemove(RecyclerView.ViewHolder holder)

Called when an item is removed from the RecyclerView.

boolean canReuseUpdatedViewHolder(RecyclerView.ViewHolder viewHolder, List<Object> payloads)

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.

If the payload list is not empty, DefaultItemAnimator returns true.

void endAnimation(RecyclerView.ViewHolder item)

Method called when an animation on a view should be ended immediately.

void endAnimations()

Method called when all item animations should be ended immediately.

boolean isRunning()

Method which returns whether there are any item animations currently running.

void runPendingAnimations()

Called when there are pending animations waiting to be started.

Inherited methods

From class android.support.v7.widget.SimpleItemAnimator
From class android.support.v7.widget.RecyclerView.ItemAnimator
From class java.lang.Object

Public constructors

DefaultItemAnimator

added in version 22.1.0
DefaultItemAnimator ()

Public methods

animateAdd

added in version 22.1.0
boolean animateAdd (RecyclerView.ViewHolder holder)

Called when an item is added to the RecyclerView. Implementors can choose whether and how to animate that change, but must always call dispatchAddFinished(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(), animateMove(), animateRemove(), and animateChange(ViewHolder, 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.

Parameters
holder RecyclerView.ViewHolder: The item that is being added.

Returns
boolean true if a later call to runPendingAnimations() is requested, false otherwise.

animateChange

added in version 22.1.0
boolean animateChange (RecyclerView.ViewHolder oldHolder, 
                RecyclerView.ViewHolder newHolder, 
                int fromX, 
                int fromY, 
                int toX, 
                int toY)

Called when an item is changed in the RecyclerView, as indicated by a call to notifyItemChanged(int) or notifyItemRangeChanged(int, int).

Implementers can choose whether and how to animate changes, but must always call dispatchChangeFinished(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(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(), animateMove(), animateRemove(), and animateChange(ViewHolder, ViewHolder, int, int, int, int) come in one by one, then start the animations together in the later call to runPendingAnimations().

Parameters
oldHolder RecyclerView.ViewHolder: The original item that changed.

newHolder RecyclerView.ViewHolder: The new item that was created with the changed content. Might be null

fromX int: Left of the old view holder