Android Code Snippet 📌 [B4A] Save a file to the Download folder (and document, pictures, music, movies, dcim folders)

Star-Dust · Feb 2, 2025

Hello everyone,

With the latest Android restrictions, direct access to the Download folder is no longer possible. However, by using MediaStore, we can save files in a way that’s fully compatible with the new system policies.

What does this snippet do?
Saves a file directly to the Download folder
Fully compatible with the latest Android versions
Does not require special permissions like WRITE_EXTERNAL_STORAGE

The app can be published on Google Play without special permissions

I’ve created a simple solution in B4A that leverages MediaStore to bypass these restrictions and make saving files to the Download folder easy and safe.

Usage example:
This code demonstrates how to save a file to the Download folder using MediaStore and doesn’t require extra permissions. It works seamlessly with the latest Android security policies.

You can see the full source code on Linkedin

Hope this helps! Feel free to ask if you have any questions or suggestions.

Star-Dust · Apr 25, 2025

On LinkedIn there is my next comment that brings to a better version of the code.
Please don't post direct links by Github, if I wanted I would have done it myself. Go to the LinkedIn page

Sabotto · Apr 26, 2025

Sorry (removed)

Jerryk · May 16, 2025

I used SaveFileToDownloads to upload a text file, e.g. logs.txt. When I use it again, the file is saved in my Download folder under the name logs (1).txt, etc. How do I know if a file already exists and how do I delete it? Can I use File.Exist and File.Delete?

Star-Dust · May 16, 2025

Jerryk said:
I used SaveFileToDownloads to upload a text file, e.g. logs.txt. When I use it again, the file is saved in my Download folder under the name logs (1).txt, etc. How do I know if a file already exists and how do I delete it? Can I use File.Exist and File.Delete?

It is not possible to read in the folder, so you cannot know if it already exists in it can be canceled

rogeriosca · Jun 2, 2025

Star-Dust said:
Hello everyone,

With the latest Android restrictions, direct access to the Download folder is no longer possible. However, by using MediaStore, we can save files in a way that’s fully compatible with the new system policies.

What does this snippet do?
Saves a file directly to the Download folder
Fully compatible with the latest Android versions
Does not require special permissions like WRITE_EXTERNAL_STORAGE

The app can be published on Google Play without special permissions

I’ve created a simple solution in B4A that leverages MediaStore to bypass these restrictions and make saving files to the Download folder easy and safe.

Usage example:
This code demonstrates how to save a file to the Download folder using MediaStore and doesn’t require extra permissions. It works seamlessly with the latest Android security policies.

You can see the full source code on Linkedin

Hope this helps! Feel free to ask if you have any questions or suggestions.

Grazie! Funziona perfettamente qui!

valerioup · Tuesday at 3:22 PM

Save in DCIM:

Sub SaveImageToDCIM(bmp As Bitmap, fileName As String)
    Dim ctxt As JavaObject
    ctxt.InitializeContext
    
    Dim values As JavaObject
    values.InitializeNewInstance("android.content.ContentValues", Null)
    values.RunMethod("put", Array("_display_name", fileName)) ' Campo corretto per il nome del file
    values.RunMethod("put", Array("title", fileName)) ' set filename
    values.RunMethod("put", Array("mime_type", "image/jpeg")) ' Tipo MIME corretto
    values.RunMethod("put", Array("relative_path", "DCIM/MyApp")) ' Cartella di destinazione DCIM
    
    Dim resolver As JavaObject = ctxt.RunMethod("getContentResolver", Null)
    Dim uri As JavaObject = resolver.RunMethod("insert", Array(GetMediaStoreImagesUri, values))
    
    If uri.IsInitialized Then
        Dim os As OutputStream = resolver.RunMethod("openOutputStream", Array(uri))
        bmp.WriteToStream(os, 100, "JPEG")
        os.Close
        Log("✅ Immagine salvata in DCIM/MyApp: " & fileName)
        ToastMessageShow("Immagine salvata", True)
    Else
        Log("❌ Errore nel salvataggio dell'immagine")
        ToastMessageShow("ERRORE", True)
    End If
End Sub

Sub GetMediaStoreImagesUri As Object
    Dim jo As JavaObject
    jo.InitializeStatic("android.provider.MediaStore$Images$Media")
    Return jo.GetField("EXTERNAL_CONTENT_URI")
End Sub

A modified version to save to the DCIM folder

Android Code Snippet 📌 [B4A] Save a file to the Download folder (and document, pictures, music, movies, dcim folders)

Star-Dust

Expert

Sabotto

Well-Known Member

Jerryk

Active Member

Star-Dust

Expert

rogeriosca

Member

valerioup

Member

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Android Code Snippet 📌 [B4A] Save a file to the Download folder (and document, pictures, music, movies, dcim folders)

Star-Dust

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Sabotto

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Jerryk

Active Member

Star-Dust

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rogeriosca

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valerioup

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