Android How to Resolve Read Only File System

[J0nathan550]

Hello, I am trying to move from temp files of android file to desired path in Android. (Downloads folder of Android) but it crashes saying that /document is read-only file system.

[thevortexcloud]

You probably need to ask for permissions. Android permissions are very complicated.

[J0nathan550]

I don't think so, read only is for entire OS (got to be) otherwise it would said permission denied.

[thevortexcloud]

Well assuming you are trying to write to / then that would be the root. Which is not writeable at all (at least not without root access, which no normal android device will have). If you want to write to the actual documents you need to use Storage Access Framework or give your app permission to write to all other locations.

https://developer.android.com/training/data-storage/shared/documents-files

The android file system is also weirdly laid out and varies by device. Generally user files are under /sdcard. But it might be also mounted under one of several other locations. A lot of this can also be hard to workout without a device that is rooted since you will get a lot of access denied errors. Which is why you are meant to just use the APIs,

[J0nathan550]

I think that I am writing to root. But it's just strange. I use Avalonia API to get path using FileDialog and for some reason it returns wrong path to file both URI and string path. I will see what I can do.

[thevortexcloud]

use Avalonia API to get path using FileDialog

To clarify, are you using the StorageProvider APIs or this?

Avalonia/src/Avalonia.Controls/SystemDialog.cs

Lines 15 to 16 in cf0158d

	[Obsolete("Use Window.StorageProvider API or TopLevel.StorageProvider API"), EditorBrowsable(EditorBrowsableState.Never)]
	public abstract class FileDialog : FileSystemDialog

In the latter case try the storage provider apis.

https://docs.avaloniaui.net/docs/concepts/services/storage-provider/

[J0nathan550]