Android Question RP.CheckAndRequest(RP.PERMISSION_WRITE_EXTERNAL_STORAGE) is not working correctly.

[joazzz]

If MLfiles does not exist, PERMISSION_WRITE_EXTERNAL_STORAGE always returns False.
B4A Version 11.80

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Private xui As XUI
End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    Dim LocRP As RuntimePermissions
    Dim LocUnusedML As MLfiles  '***If the LocUnusedML declaration variable is removed, the result is always False.***
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Dim PhoneVer As Phone
    If PhoneVer.SdkVersion >= 23 Then '23:Android v6.0
        If LocRP.Check(LocRP.PERMISSION_WRITE_EXTERNAL_STORAGE) = False Then
            LocRP.CheckAndRequest(LocRP.PERMISSION_WRITE_EXTERNAL_STORAGE)
            Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
            xui.MsgboxAsync(Result,"Result:")
            '***If the LocUnusedML declaration variable is removed, the result is always False.***
        End If
    End If
    
    Activity.LoadLayout("Layout")
End Sub

Sub Activity_Resume
End Sub

Sub Activity_Pause (UserClosed As Boolean)
End Sub

Sub Button1_Click
    ExitApplication
End Sub

 

[zed]

hi Joazz, By adding a permission in the manifest, for me it works correctly.

in the manifest : AddPermission(android.permission.WRITE_EXTERNAL_STORAGE)

 

[Spavlyuk]

See notes for API levels 29 and 30:

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

 

[agraham]

You also need a manifest entry to obtain the permission. It is added automatically if you reference certain paths in your code. Press the 'List Permissions' button at the bottom of the logs pane to see if the IDE has added the permission. As I don't know what MLfiles is check with and without your MLFiles declaration.

 

[joazzz]

I got it.
Adding the permission to the manifest solved it.
AddPermission(android.permission.WRITE_EXTERNAL_STORAGE)
Or
Use File.DirRootExternal in source code. ex) If PhoneVer.SdkVersion < 29 Then StrPath = File.DirRootExternal
thank you.