SESL Material/com.google.android.material.internal/ExpandCollapseAnimationHelper/getExpandAnimator

getExpandAnimator

@NonNull
open fun getExpandAnimator(): Animator

It's important that the expandedView has been measured (ie is not GONE) before this Animator is run, or else it will not expand to the correct size. This can be accomplished by setting the expandedView to INVISIBLE and posting the start() from it.

Return

an Animator that can be run to expand the expandedView and collapse the collapsedView