Android Question How to use ExternalStorage

[Xfood]

Goodmorning everyone,
I'm trying to use this library for
Read a file in the Download folder
But I don't know how to pass the correct parameter,
I took the example from here:

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

Here is my code:

Private Sub Button1_Click
    Private cNomeFileArticoli As String = "download/articoli.csv"
    Dim ReaderFileTxt As TextReader

    If File.Exists(File.DirRootExternal, cNomeFileArticoli)= True Then
        'ReaderFileTxt.Initialize(File.OpenInput(File.DirRootExternal, cNomeFileArticoli)) '  works with SDK 29 does not work with SDK 30
        
        ReaderFileTxt.Initialize(Storage.OpenInputStream(cNomeFileArticoli))   ' not correct
    End If

End Sub

when I compile it gives me this error
B4A Versione: 10.70
Analisi del Codice. (0.01s)
Java Versione: 14
Building folders structure. (0.02s)
Compilazione del codice. (0.02s)
Compilazione del codice di layouts (0.03s)
Organizzazione Librerie. (0.03s)
(AndroidX SDK)
Compiling resources (0.24s)
Linking resources (0.44s)
Compilazione del codice Java prodotto. Error
B4A line: 139
ReaderFileTxt.Initialize(Storage.OpenInputStream
src\b4a\example3\main.java:434: error: incompatible types: String cannot be converted to _externalfile
_readerfiletxt.Initialize((java.io.InputStream)(_storage._openinputstream /*anywheresoftware.b4a.objects.streams.File.InputStreamWrapper*/ ((b4a.example3.externalstorage._externalfile)(_cnomefilearticoli)).getObject()));

 

[Erel]

This is not how ExternalStorage works. Learn the example: https://www.b4x.com/android/forum/threads/externalstorage-access-sd-cards-and-usb-sticks.90238/

The user needs to select the downloads folder and only then you can access it.

If you are looking for a single file then it will be easier to get it with ContentChooser.

 

[Xfood]

I also tried ContentChooser, to read a file from the Download folder, but unfortunately I can't.
I try to study better
Thank you

 

[asales]

Here is my code to open a CSV file using ContentChooser:

Private Sub btnGetCSV_Click
    CC.Show("text/comma-separated-values", "CSV File")
    Wait For CC_Result (Success As Boolean, Dir As String, FileName As String)
    If Success Then       
        Dim tr As TextReader
        tr.Initialize(File.OpenInput(Dir, FileName))
        Dim line As String
        line = tr.ReadLine
        Do While line <> Null
            Log(line)
            line = tr.ReadLine
        Loop
        tr.Close
    End If   
End Sub

 

[Erel]

Small change:

tr.Initialize(File.OpenInput(Dir, FileName))
Dim lines As List = tr.ReadList
For Each line As String In lines

Next

 

[Xfood]

thanks, and just what I needed