Android Question MakeDir not working on Android 10

[Melghost]

Hi.

I've recently updated my phone and my version of B4A to 10.70.

Unfortunately there are some things that have stopped working but they always worked fine for me before. I don't know what I'm doing wrong.

The code is simple:

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
    
    File.MakeDir(File.DirRootExternal, "Melghost/Prueba")
    
End Sub

This code will run without apparent errors, but no folder will be created.

This is what appears on the Manifest Editor window:

AddManifestText(
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="29"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
CreateResourceFromFile(Macro, Themes.LightTheme)

Maybe I'm losing some "how to"s on newer Android versions?

Thank you.


Phone: UniHertz Jelly2
Android version: 10

 

[agraham]

RunTimePermissions
Runtime Permissions (Android 6.0+ Permissions) | B4X Programming Forum

Things tend to change with monotonous regularity, getting tighter every time
android.jar / targetSdkVersion / minSdkVersion | B4X Programming Forum

 

[JohnC]

This might help:

ExternalStorage - Access SD cards and USB sticks

Before we start: External storage means a real sd card or a connected mass storage USB device. This class can also be used to access the secondary storage (File.DirRootExternal). This becomes relevant with newer versions of Android that restrict direct access. It has nothing to do with runtime...

www.b4x.com

Note line #2:

2.This class can also be used to access the secondary storage (File.DirRootExternal). This becomes relevant with newer versions of Android that restrict direct access.

 

[agraham]

This might help:

That is of much less use under Android 11 than it was as it is now has restricted access.
Android 11 storage FAQ. First introduced in Android 10, scoped… | by nandana | Android Developers | Medium

Storage Access Framework (SAF) is indeed one option that allows the user to grant access to directories and files. However, note that there are access restrictions to certain directories, such as the root and Android/data directories.

I am already/will be using this for my own apps but you can't use it if you want your apps in the Play Store.
Manage External Storage - access internal external storage >= SDK 30 | B4X Programming Forum

 

[Melghost]

Thank you very much.