flutter列表视图监听文件目录中的更改并重新构建小部件

import 'dart:io';
import 'package:flutter/material.dart';

class FileWatcherExample extends StatefulWidget {
  @override
  _FileWatcherExampleState createState() => _FileWatcherExampleState();
}

class _FileWatcherExampleState extends State<FileWatcherExample> {
  FileWatcher _fileWatcher;
  int _fileChangeCount = 0;

  @override
  void initState() {
    super.initState();
    _startFileWatcher();
  }

  @override
  void dispose() {
    _stopFileWatcher();
    super.dispose();
  }

  void _startFileWatcher() {
    _fileWatcher = FileWatcher(File('path/to/directory'));
    _fileWatcher.events.listen((event) {
      setState(() {
        _fileChangeCount++;
      });
    });
  }

  void _stopFileWatcher() {
    _fileWatcher?.close();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('File Watcher Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'File Change Count:',
              style: TextStyle(fontSize: 20),
            ),
            Text(
              '$_fileChangeCount',
              style: TextStyle(fontSize: 40, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}