Unable to Write File in Selected Path

[LibertyBeta]

Describe the bug
After succesfully picking a path, I am unable to then write files/edit files in that path. This is fairly important as they are choosing where to save a sqlite DB.

Issue details

1. Android
2. 11
3. Detailed steps to reproduce

• Pick a Directory with getDirectoryPath
• Get asked classic "Allow apps write permissions"
• Open native file picker, not in /
• Go to dir.
• Tap Select

Error Log
D/FilePickerDelegate(29855): [SingleFilePick] File URI:content://com.android.externalstorage.documents/tree/primary%3Akanso/document/primary%3Akanso
W/p.plaster.kans(29855): Accessing hidden method Landroid/os/storage/StorageManager;->getVolumeList()[Landroid/os/storage/StorageVolume; (greylist, reflection, allowed)
W/p.plaster.kans(29855): Accessing hidden method Landroid/os/storage/StorageVolume;->getPath()Ljava/lang/String; (greylist-max-q,test-api, reflection, allowed)
I/flutter (29855): /storage/emulated/0/kanso
E/flutter (29855): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: FileSystemException: Cannot create file, path = '/storage/emulated/0/kanso/entries.db' (OS Error: Operation not permitted, errno = 1)
E/flutter (29855): #0 _File.throwIfError (dart:io/file_impl.dart:635:7)
E/flutter (29855): #1 _File.createSync (dart:io/file_impl.dart:273:5)
E/flutter (29855): #2 AppState.setupRoot (package:kanso/providers/app.dart:119:12)
E/flutter (29855):
E/flutter (29855): #3 OnBoard.build. (package:kanso/views/onboard.dart:13:61)
E/flutter (29855): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
E/flutter (29855): #5 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:1111:38)
E/flutter (29855): #6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
E/flutter (29855): #7 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
E/flutter (29855): #8 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
E/flutter (29855): #9 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:222:7)
E/flutter (29855): #10 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:476:9)
E/flutter (29855): #11 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:77:12)
E/flutter (29855): #12 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:122:9)
E/flutter (29855): #13 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
E/flutter (29855): #14 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:120:18)
E/flutter (29855): #15 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:106:7)
E/flutter (29855): #16 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:370:19)
E/flutter (29855): #17 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:350:22)
E/flutter (29855): #18 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:266:11)
E/flutter (29855): #19 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:305:7)
E/flutter (29855): #20 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
E/flutter (29855): #21 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
E/flutter (29855): #22 _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (29855): #23 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (29855): #24 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (29855): #25 _invoke1 (dart:ui/hooks.dart:265:10)
E/flutter (29855): #26 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
E/flutter (29855):

[miguelpruivo]

@LibertyBeta which directory are you picking? There are some dirs that are protected by OS and can’t be directly written (such as downloads folder).

[LibertyBeta]

If you look at the log it's a folder I created for the purpose of putting stuff for the app in it. And the library returns the path fine.

Edit: I'll try to get a minimal viable reproduction example put together tonight.

[miguelpruivo]

@LibertyBeta this seems to be a common issue with Flutter accessing some directories for writing. Found some threads like this.

Someone suggested that using requestLegacyStorage = true on your manifest file (under Application tag) fixed it. See here. Would you mind to try and see if it worked for you?

Thank you!

[LibertyBeta]

That flag doesn't work in 11, as its been deprecated.

[miguelpruivo]

@LibertyBeta I really would like to help you, however it seems that everything should work as it is. 😔

As you can see, there are similar reported issues with other plugins that try to write/use path permissions. This could be a something with Flutter, but I’m out on vacations and I might do a further investigation when I come back.

Have you tried creating the file with a different name, for example?

[LibertyBeta]

I have. I'm going to try an MVP of the file management api for 11 on my own and compare the differences. I'll get back to you with my research.

[miguelpruivo]

That would be great. If there’s anything I can do to help, let me know.

I’ll set this on hold until further details.

Thank you.

[LibertyBeta]

See #394