Android Question Problem File.WriteString - Permission denied

[awama]

Hallo

this code run on Android 5.0 ,
writing Text-File on USB-Drive

now I have an new Handy with Android 8.0 and I habe this Problem with File.WriteString
I try with
SDK 19, 26, 28 and
AddPermission(android.permission.WRITE_EXTERNAL_STORAGE)

If File.Exists("/storage/USBstickName/Foldername","Settings.txt") Then 'this works
Settings=File.ReadString("/storage/USBstickName/Foldername","Settings.txt") 'this works

If Settings = 1 then
File.WriteString("/storage/USBstickName/Foldername","Settings.txt", "2") 'this doesn't work with error (Permission denied)
end if

Else

Settings=DefSetting
EndIf

What can I do?

Best thanks

awama

 

[DonManfred]

Please use Code Tags when posting code.

File.WriteString("/storage/USBstickName/Foldername","Settings.txt", "2") 'this doesn't work with error (Permission denied)

Starting from Android 4.4 it is no longer possible to directly access external storages.

Writing to USB Sticks or External SDCards can only be done with this Class:
https://www.b4x.com/android/forum/threads/externalstorage-access-sd-cards-and-usb-sticks.90238/

 

[awama]

Thanks for fast reply,

but my Code works with Android 5.1 ...

I will try now with the externalstorage class

 

[DonManfred]

Are you using TargetSDK 26 in your App?
TargetSDK 26 is recommended to use in your Manifest. Google requires it.

https://www.b4x.com/android/forum/threads/android-jar-targetsdkversion-minsdkversion.87610/

For any new question you have you should create a new Thread.

 

[awama]

Yes, I using TargetSDK 26, 27 , 28

must I select my file to copy to USB-Stick first manually in Listview (with ExternalStorage Class ) ?

Is it not possible programmable copy one file from intern to USB-Stick?

 

[DonManfred]

must I select my file to copy to USB-Stick first manually in Listview (with ExternalStorage Class ) ?

With the class you need to select the ROOT Dir of the External SDCard.
For the rest you need to use the SAF.
https://www.google.de/search?source.......1..gws-wiz.....0..35i39j0i131.Tdg6F0JV9-U

Away from that you should ALWAYS create a NEW Thread for any new Question you have.

 

[DonManfred]

You can find an Example code here:
https://www.b4x.com/android/forum/threads/copy-a-file-from-internal-memory-to-sd-card.102705/

NOTE that it is a quite complicated Framework.