您需要 path_provider 包>

然后尝试以下代码:

  Future< void>_deleteCacheDir()异步{最后的cacheDir =等待getTemporaryDirectory();如果(cacheDir.existsSync()){cacheDir.deleteSync(recursive:true);}}Future< void>_deleteAppDir()异步{最后的appDir =等待getApplicationSupportDirectory();if(appDir.existsSync()){appDir.deleteSync(recursive:true);}} 

In my flutter app, I store some images in cache directory and some files in application document directory, now I want to add possibility to my users to delete the cache dir and app dir, How can I achieve this?

You need path_provider package

Then try this code:

  Future<void> _deleteCacheDir() async {
    final cacheDir = await getTemporaryDirectory();

    if (cacheDir.existsSync()) {
      cacheDir.deleteSync(recursive: true);
    }
  }

  Future<void> _deleteAppDir() async {
    final appDir = await getApplicationSupportDirectory();

    if(appDir.existsSync()){
      appDir.deleteSync(recursive: true);
    }
  }