Android Question Filedialog shows no folders and/or files on some devices (android 10)

[mc73]

After my last app update, targeting SDK 29, I receive some emails by users, with screenshots showing that no directories and/or files are shown while opening fileDialog with path set to dirRootExternal. These users insist that there was no problem in the previous app version.
Unfortunately I cannot replicate this, and to be honest, I'm not even sure that changing the target SDK made a difference, since on my personal phone with android 11, and others with android 10 and 9, there is no problem at all.

Here's my code, first I get permissions:

rp.CheckAndRequest(rp.PERMISSION_READ_EXTERNAL_STORAGE)
    wait for activity_PermissionResult (Permission As String, Result As Boolean)
    If Result Then 
        openFileBrowser
    end if

And then opening the fileDialog:

Private sd As FileDialog
    sd.FilePath=File.DirRootExternal
    sd.TextColor=Colors.Black 
    sd.FileFilter=".myFileExtension"
    Private sf As Object=sd.ShowAsync("Choose file","OK","Cancel","",Null,False)
    wait for (sf) dialog_result (rt As Int)
    If rt=DialogResponse.POSITIVE Then 
    end if

Wonder if anyone else noted such behavior and if there's a straight forward solution to this which I missed reading about.

(Note: I am aware of the contentChooser lib, still I'm not quite sure if I can really set the filter to my app's file extension format, but in the end if I have to use this, I will open another thread with my specific question.)

 

[JohnC]

Did you try adding this to the manifest:

SetApplicationAttribute(android:requestLegacyExternalStorage, true)

As suggested with SDK 29 in this post:

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

www.b4x.com

 

[mc73]

Did you try adding this to the manifest:

SetApplicationAttribute(android:requestLegacyExternalStorage, true)

As suggested with SDK 29 in this post:

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

www.b4x.com

Thank you very much, I will surely do that!
However, just wondering, in most of devices there is no problem at all.