Flutter添加文件目录管理path_provider

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  path_provider: ^2.1.2

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import 'package:path_provider/path_provider.dart';

class FileMgr {
  FileMgr._privateConstructor();

  static final FileMgr instance = FileMgr._privateConstructor();
  //文档目录
  String? _documentsDirectory;
  //临时目录
  String? _temporaryDirectory;
  //
  String? _cacheDirectory;

  //获取文档目录
  Future<String> getDocumentsDirectory() async {
    _documentsDirectory ??= (await getApplicationDocumentsDirectory()).path;

    return _documentsDirectory!;
  }

//获取临时目录
  /// - `NSCachesDirectory` on iOS and macOS.
  /// - `Context.getCacheDir` on Android.
  Future<String> getTemporaryDirectoryPath() async {
    _temporaryDirectory ??= (await getTemporaryDirectory()).path;
    return _temporaryDirectory!;
  }

//获取缓存目录
  Future<String> getApplicationSupportDirectoryPath() async {
    _cacheDirectory ??= (await getApplicationSupportDirectory()).path;
    return _cacheDirectory!;
  }
}

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 debugPrint('cacheDirectory:${await FileMgr.instance.getApplicationSupportDirectoryPath()}\n documentsDirectory:${await FileMgr.instance.getDocumentsDirectory()} \n temporaryDirectoryPath:${await FileMgr.instance.getTemporaryDirectoryPath()}');

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flutter: cacheDirectory:/Users/ksnowlv/Library/Developer/CoreSimulator/Devices/F35779E0-8AA1-4124-BECC-E1945A8E4000/data/Containers/Data/Application/DD4D8EF3-1CC4-4B8D-9C8F-DF0726E2C55E/Library/Application Support
flutter:  documentsDirectory:/Users/ksnowlv/Library/Developer/CoreSimulator/Devices/F35779E0-8AA1-4124-BECC-E1945A8E4000/data/Containers/Data/Application/DD4D8EF3-1CC4-4B8D-9C8F-DF0726E2C55E/Documents
flutter:  temporaryDirectoryPath:/Users/ksnowlv/Library/Developer/CoreSimulator/Devices/F35779E0-8AA1-4124-BECC-E1945A8E4000/data/Containers/Data/Application/DD4D8EF3-1CC4-4B8D-9C8F-DF0726E2C55E/Library/Caches