使用不同的GlobalKey将小部件区分开来，使它们得到正确的更新。以下是示例代码。

class MyAnimatedList extends StatefulWidget {
  @override
  _MyAnimatedListState createState() => _MyAnimatedListState();
}

class _MyAnimatedListState extends State {
  List _list = ['A', 'B', 'C'];
  final GlobalKey _listKey = GlobalKey();
  final List> _itemKeys = [
    GlobalKey(),
    GlobalKey(),
    GlobalKey(),
  ];

  @override
  Widget build(BuildContext context) {
    return AnimatedList(
      key: _listKey,
      initialItemCount: _list.length,
      itemBuilder: (context, index, animation) {
        return MyItem(
          key: _itemKeys[index],
          text: _list[index],
          animation: animation,
        );
      },
    );
  }

  void addItem(String item) {
    final newIndex = _list.length;
    _list.add(item);
    _listKey.currentState.insertItem(newIndex);
  }

  void removeItem(int index) {
    final removedItem = _list.removeAt(index);
    _listKey.currentState.removeItem(
      index,
      (context, animation) => MyItem(
        key: _itemKeys[index],
        text: removedItem,
        animation: animation,
      ),
    );
  }
}

class MyItem extends StatefulWidget {
  final String text;
  final Animation animation;

  MyItem({
    Key key,
    this.text,
    this.animation,
  }) : super(key: key);

  @override
  MyItemState createState() => MyItemState();
}

class MyItemState extends State {
  @override
  Widget build(BuildContext context) {
    return SizeTransition(
      sizeFactor: widget.animation,
      child: ListTile(
        title: Text(widget.text),
      ),
    );
  }
}