question: public void playTogether ( Collection < Animator > items ) { if ( items != null && items . size ( ) > 0 ) { mNeedsSort = true ; Builder builder = null ; for ( Animator anim : items ) { if ( builder == null ) { builder = play ( anim ) ; } else { builder . with ( anim ) ; } } } }
target:  Sets up this AnimatorSet to play all of the supplied animations at the same time.