如何在本地存储/外部 Flutter 中创建文件夹？

Question

   import 'package:path_provider/path_provider.dart';
   import 'dart:io';
   void createAppFolder() async {
       final directory = await getExternalStorageDirectory();
       final dirPath = '${directory.path}/some_name' ;
       await new Directory(dirPath).create();
    }

这是我尝试过的，当然我设置了写入存储的权限，但是这段代码在这个路径上创建了一个目录/storage/emulated/0/Android/data/com.example.test_app/files/some_name 我需要的是在这条路径上创建/storage/emulated/0/some_name 任何关于我做错了什么的想法，或者他们是另一种方式来做到这一点？？

Answer 1

如果你想在/storage/emulated/0 中创建目录，试试这个。

import 'dart:io';
 _createFolder()async{
final folderName="some_name";
final path= Directory("storage/emulated/0/$folderName");
if ((await path.exists())){
  // TODO:
  print("exist");
}else{
  // TODO:
  print("not exist");
  path.create();
}

}

Answer 2

这对我有用
permission_handler

但首先要在您的 Android Manifest 中设置权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Future<String> createFolder(String cow) async {
  final folderName = cow;
  final path = Directory("storage/emulated/0/$folderName");
  var status = await Permission.storage.status;
  if (!status.isGranted) {
    await Permission.storage.request();
  }
  if ((await path.exists())) {
    return path.path;
  } else {
    path.create();
    return path.path;
  }
}

IOS 和 Android 的 OR（最佳）

  Future<String> createFolder(String cow) async {
    final dir = Directory((await getExternalStorageDirectory())!.path + '/$cow');
    var status = await Permission.storage.status;
    if (!status.isGranted) {
      await Permission.storage.request();
    }
    if ((await dir.exists())) {
      return dir.path;
    } else {
      dir.create();
      return dir.path;
    }
  }

注意：
如果您将 createFolder(".folder") 命名为该文件夹，则该文件夹将被隐藏。
如果您在文件夹中创建.nomedia 文件，其他应用将无法扫描您的文件夹。

Answer 3

根据插件代码，getExternalStorageDirectory() 函数采用 StorageDirectory 类型的可选参数。您可以尝试提供类型参数。 可用的类型有：

enum StorageDirectory {
  /// Contains audio files that should be treated as music.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_MUSIC.
  music,

  /// Contains audio files that should be treated as podcasts.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_PODCASTS.
  podcasts,

  /// Contains audio files that should be treated as ringtones.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_RINGTONES.
  ringtones,

  /// Contains audio files that should be treated as alarm sounds.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_ALARMS.
  alarms,

  /// Contains audio files that should be treated as notification sounds.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_NOTIFICATIONS.
  notifications,

  /// Contains images. See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_PICTURES.
  pictures,

  /// Contains movies. See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_MOVIES.
  movies,

  /// Contains files of any type that have been downloaded by the user.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_DOWNLOADS.
  downloads,

  /// Used to hold both pictures and videos when the device filesystem is
  /// treated like a camera's.
  ///
  /// See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_DCIM.
  dcim,

  /// Holds user-created documents. See https://developer.android.com/reference/android/os/Environment.html#DIRECTORY_DOCUMENTS.
  documents,
}

更多详情可以参考this code 如果您的问题仍未解决，您可以向插件作者提出请求。

希望对你有帮助。