flutter中清空本应用的缓存文件

在Flutter中清空本应用的缓存文件可以使用flutter_cache_manager库提供的清空缓存方法。具体实现步骤如下：

1. 在pubspec.yaml文件中添加flutter_cache_manager依赖：

dependencies:
  flutter_cache_manager: ^2.2.1

2. 导入库：

import 'package:flutter_cache_manager/flutter_cache_manager.dart';

3. 在需要清空缓存的地方调用clearCache()方法：

await DefaultCacheManager().emptyCache();

完整示例代码：

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Cache Manager Example',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Cache Manager Example'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Clear Cache'),
          onPressed: () async {
            await DefaultCacheManager().emptyCache();
            print('Cache cleared');
          },
        ),
      ),
    );
  }
}
``