Android Question How to write to external USB storage?

[Meuke]

Hello,
I am trying to write a file to an external USB stick.
The problem is that I get an error "java.io.FileNotFoundException: /storage/6233-3230/gsi/METING_Cloud_1_16.gsi (Permission denied)"
What I can do is check for the presence of a directory on the external USB device.
Writing to the external USB stick results in an error -> Permission denied.
Can someone help me out on this one?

Sub FindUsbDevice As String
    'CHECK - UsbStorage
    If (File.Exists("/storage/6233-3230/gsi", "") = True) Then
        Return "/storage/6233-3230/gsi Directory was found"
        
        Write_2_File("/storage/6233-3230/Gsi/", strBestandsUit_gsi , Resultaat_AES_Decrypt)
        
    Else
        Return "Error : Directory gsi was not found"
    End If
End Sub


Sub Write_2_File(DirTarget As String, FileTarget As String,Text_string As String) As String
    Dim My_txt_Writer As TextWriter
    Dim data_out As String
    data_out = Text_string
    My_txt_Writer.Initialize(File.OpenOutput(DirTarget,FileTarget,False))
    My_txt_Writer.Write(data_out)
    My_txt_Writer.Close
    Return data_out
    
End Sub

 

[Erel]

ExternalStorage - Access SD cards and USB sticks

 

[Meuke]

ExternalStorage - Access SD cards and USB sticks

Yes I looked already in this example but via this method I could not get it to work to write a file to the external USB disk.
Can you give an example code on how to write a file to the USB device?

 

[Erel]

This is the only way to write to an USB device. You need to provide more information. Were you able to read files?

 

[Meuke]

In the program example above it returned "/storage/6233-3230/gsi Directory was found"
This means that the directory "/storage/6233-3230/Gsi/" could be found on the usb device...

 

[Erel]

ExternalStorage - Access SD cards and USB sticks: https://www.b4x.com/android/forum/threads/90238

This is the only way to write to an USB device.