Flutter Unable to create directory (OS Error: Read-only file system)

Question

I was following - how to create directory from https://docs.flutter.io/flutter/dart-io/Directory-class.html

new Directory('dir/subdir').create(recursive: true)
  // The created directory is returned as a Future.
  .then((Directory directory) {
    print(directory.path);
});

This is the error I am getting:

FileSystemException: Creation failed, path = 'dir' (OS Error: Read-only file system, errno = 30)

I have enabled Storage(WRITE_EXTERNAL_STORAGE) permission. (Android device)

What am I missing?

Use https://pub.dartlang.org/packages/path_provider to get valid paths where you can read/write files. — Günter Zöchbauer, Jul 31 '18 at 06:50
@GünterZöchbauer thanks. Flutter Docs are slightly confusing. — UpaJah, Jul 31 '18 at 07:25
Reading the docs I get that mostly all of them work only for Android and iOS. Is there a valid directory that could work for linux? — Iván Yoed, Feb 24 '21 at 23:12

score 38 · Accepted Answer · answered Jul 31 '18 at 07:22

38

Got it (Using path_provider plugin to get correct path)

Directory appDocDirectory = await getApplicationDocumentsDirectory();

new Directory(appDocDirectory.path+'/'+'dir').create(recursive: true)
// The created directory is returned as a Future.
    .then((Directory directory) {
  print('Path of New Dir: '+directory.path);
});

answered Jul 31 '18 at 07:22

UpaJah

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Is there a sycnhronous version of `Directory appDocDirectory = await getApplicationDocumentsDirectory();`? – Shiv Mar 28 '23 at 02:59

Kamlesh Kanazariya · Answer 2 · 2019-11-28T10:29:22.053

Update : New Flutter plugin permission_handler have taken care below thing so change your plugin to permission_handler

If you are testing in Android Oreo and want to write file in external storage then you need to ask WRITE_EXTERNAL_STORAGE

According to "https://developer.android.com/about/versions/oreo/android-8.0-changes.html#rmp"

If the app targets Android 8.0 (API level 26), the system grants only READ_EXTERNAL_STORAGE at that time; however, if the app later requests WRITE_EXTERNAL_STORAGE, the system immediately grants that privilege without prompting the user.

Permission Plugin ask only READ_EXTERNAL_STORAGE permission by Permission.requestPermissions([PermissionName.Storage]); so You need to ask for WRITE_EXTERNAL_STORAGE.

You can use my repo for asking WRITE_EXTERNAL_STORAGE in pubspec.yaml:

permission:
    git:
    url: https://github.com/kamlesh9070/permission

score 0 · Answer 3 · answered Aug 23 '20 at 10:03

If you have given the WRITE_EXTERNAL_STORAGE permission but still not able to create the directory,

you can try manually uninstalling the Flutter App from the device,

and rerun it.

NOTE: make sure after the installation, allow the storage permission from the app settings.

It works for me after struggling for hours (I don't know why this solution works)

Flutter Unable to create directory (OS Error: Read-only file system)

3 Answers3

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