Android Question CheckAndRequest Error

[cdsincfl]

I am updating an app to Android 11 and have raised the targetSdkVersion="28".
My app compiles and runs but I now need to deal with requesting access to File.DirRootExternal so the App can access the secondary storage.

I have used rp.GetSafeDirDefaultExternal but that returns a path to DefaultExternal not DirRootExternal.

I have read and viewed the video for RuntimePermission CheckAndRequest and get an error when I add it to my App.
I used the following code for testing:

    rp.CheckAndRequest(rp.PERMISSION_READ_EXTERNAL_STORAGE)
    wait for Activity_PermissionResult (Permission As String, Result As Boolean)
    If Result Then
        Log("Got Permission")
    Else
        Log("No Permission")
    End If

If I place this code in Activity_Create I get an error that my B4XViews button is not initialized when I attempt to set the button text later in the App.
If I place the code in Activity_Resume I do not get the error and the app compiles and runs.

I need to get permission to access DirRootExternal before Activity_Resume since the App reads and writes data to the External storage when the app starts. I currently have the code to read and write the data to External storage in the Starter Service but I need to check and get permission before that. I can move the code back to the Activity_Create but I get the error if I put the CheckAndRequest in Activity_Create.

The App runs fine except I don't know where to place the CheckAndRequest so I can get the permissions before I read and write to the DirRootExternal location without getting the error.

 

[agraham]

Remember that Wait For returns from the Sub containing it immediately and the Sub is re-entered later when the Wait expires. What is probably happening here is that when the Wait For returns from Activity_Create then Activity_Resume is run immediately. the app is probably erroring because you have initialisation code after the Wait For in Activity_Create that something in Activity_Resume relies on.

 

[cdsincfl]

Thanks agraham.
All is working well now.