animateChange

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().