@Override
    public boolean isRunning() {
        for (Node node : mNodes) {
            if (node.animation.isRunning()) {
                return true;
            }
        }
        return false;
    }
@ Override public boolean isRunning ( ) { for ( Node node : mNodes ) { if ( node . animation . isRunning ( ) ) { return true ; } } return false ; }
Returns true if any of the child animations of this AnimatorSet have been started and have
not yet ended.
@return Whether this AnimatorSet has been started and has not yet ended.