如何在ListView中显示搜索到的数据？错误:没有为类'Object‘定义运算符'[]’

import 'package:flutter/material.dart';

class SearchListView extends StatefulWidget {
  @override
  _SearchListViewState createState() => _SearchListViewState();
}

class _SearchListViewState extends State<SearchListView> {
  List<String> dataList = [
    'Apple',
    'Banana',
    'Cherry',
    'Durian',
    'Grape',
    'Lemon',
    'Orange',
    'Peach',
    'Strawberry',
    'Watermelon',
  ];

  List<String> filteredList = [];

  void filterData(String keyword) {
    setState(() {
      filteredList = dataList
          .where((item) => item.toLowerCase().contains(keyword.toLowerCase()))
          .toList();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Search ListView'),
      ),
      body: Column(
        children: [
          Padding(
            padding: EdgeInsets.all(8.0),
            child: TextField(
              onChanged: (value) => filterData(value),
              decoration: InputDecoration(
                labelText: 'Search',
              ),
            ),
          ),
          Expanded(
            child: ListView.builder(
              itemCount: filteredList.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(filteredList[index]),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: SearchListView(),
  ));
}