Kenny Kenny - 3 months ago 126
Android Question

How to implement ItemAnimator of RecyclerView to disable the animation of notifyItemChanged

In my project I need disable the "change" animation of

RecyclerView
while
notifyItemChanged
.

I investigated in the source of
RecyclerView
and had overridden
android.support.v7.widget.DefaultItemAnimator
as below:

private static class ItemAnimator extends DefaultItemAnimator
{
@Override
public boolean animateChange(RecyclerView.ViewHolder oldHolder, RecyclerView.ViewHolder newHolder, int fromX, int fromY, int toX, int toY) {
if(oldHolder != null)
{
oldHolder.itemView.setVisibility(View.INVISIBLE);
dispatchChangeFinished(oldHolder, true);
}

if(newHolder != null)
{
dispatchChangeFinished(newHolder, false);
}

return false;
}
}


But I am not sure if I match the spec of the Google document:
RecyclerView.ItemAnimator.animateChange


According to my understanding source code, if I do not override the method properly, the oldHolder will not be recycled.

Please help me figure out how to override
animateChange
in a correct way.

Answer

I have found the correct solution to just remove the animateChange.

It's very simple. Google has implemented the functionality.

((SimpleItemAnimator) RecyclerView.getItemAnimator()).setSupportsChangeAnimations(false);

Documentation: setSupportsChangeAnimations