MAUI file picker returns a cached file address on android platform

Question

I use FilePicker to pick address of files that user selected but in android it seems copy the user selected files to cache folder and returns that copied files address.

 private async void bExecute_Clicked(object sender, EventArgs e)
    {
        FilePickerFileType customFileType = new FilePickerFileType(
        new Dictionary<DevicePlatform, IEnumerable<string>>
        {
                        { DevicePlatform.iOS, new[] { "public.audio" } }, // UTType values
                        { DevicePlatform.Android, new[] { "audio/*" } }, // MIME type
                        { DevicePlatform.WinUI, new[] { ".mp3", ".wav", ".wma", ".m4a", ".flac" } }, // file extension
                        { DevicePlatform.Tizen, new[] { "*/*" } },
                        { DevicePlatform.macOS, new[] { ".mp3", ".wav", ".wma", ".m4a", ".flac" } }, // UTType values
        });
        PickOptions options = new()
        {
            PickerTitle = "Please select audio file's",
            FileTypes = customFileType
        };

        var fileResult = await FilePicker.Default.PickMultipleAsync(options);

        // Let user pick files (and handling cancelling)
        foreach (FileResult file in fileResult)
        {
            var tfile = TagLib.File.Create(file.FullPath);
                  ...
        }
    }

it returns something like this on android

but in windows it works normally.

Answer 1

Hello,

You can use ContentResolver to update the audio file by audio id. UpdateAlbumInformation(1000000037, "TestAudio");

public void UpdatedisplayNameInformation(long audioId, string displayName)
    {
       ContentResolver contentResolver = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver;     
            // Create the content values object to hold the new display name information
            ContentValues values = new ContentValues();
            values.Put(Android.Provider.MediaStore.Audio.Media.InterfaceConsts.DisplayName, displayName);
        // Build the content URI for the specific audio file using its ID
            Android.Net.Uri contentUri = ContentUris.WithAppendedId(Android.Provider.MediaStore.Audio.Media.ExternalContentUri, audioId);
            contentResolver.Update(contentUri, values, null, null);
       
    }

How to get the audio id? You can use MediaStore to get it.

Firstly, you need to add following permission to your AndroidManifest.xml file.

 <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Then, you need to check the StorageRead permission, if this permission is granted, you can use Mediastore to get all of the audio file, I tested file type is .mp3, So I set MIME type to "audio/mpeg", you can use Cursor to get audio ID like following code.

PermissionStatus status = await Permissions.CheckStatusAsync<Permissions.StorageRead>();
       
        if (status == PermissionStatus.Granted)
        {          
            var projection = new List<string>()
                {
                    Android.Provider.MediaStore.Audio.Media.InterfaceConsts.Id,
                    Android.Provider.MediaStore.Audio.Media.InterfaceConsts.DisplayName,
                   Android.Provider.MediaStore.Audio.Media.InterfaceConsts.DateAdded,
                  Android.Provider.MediaStore.Audio.Media.InterfaceConsts.Title,
                   Android.Provider.MediaStore.Audio.Media.InterfaceConsts.RelativePath,
                  Android.Provider.MediaStore.Audio.Media.InterfaceConsts.MimeType
                }.ToArray();





           string selection = Android.Provider.MediaStore.Audio.Media.InterfaceConsts.MimeType + " = ?";

           var selectionArgs = new List<string>()
            {
                    "audio/mpeg"
            };

           ContentResolver contentResolver = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver;
            ICursor cursor = contentResolver.Query(Android.Provider.MediaStore.Audio.Media.ExternalContentUri, projection, selection, selectionArgs.ToArray(), null);
            if (cursor != null && cursor.Count > 0)
            {
                int idColumn = cursor.GetColumnIndexOrThrow(Android.Provider.MediaStore.Audio.Media.InterfaceConsts.Id);
                int dispNameColumn = cursor.GetColumnIndexOrThrow(Android.Provider.MediaStore.Audio.Media.InterfaceConsts.DisplayName);
                cursor.MoveToFirst();




               do
                {
                    //1000000034
                    long id = cursor.GetLong(idColumn);
                    string displayName = cursor.GetString(dispNameColumn);
                    Android.Net.Uri uri1 = Android.Provider.MediaStore.Audio.Media.ExternalContentUri.BuildUpon().AppendPath(id.ToString()).Build();
                    //"content://media/external/audio/media/1000000037"
                    string androidUri = uri1.ToString();
                    long androidFileId = id;
                    break;

               }
                while (cursor.MoveToNext());
               cursor.Close();
                cursor.Dispose();
            }
        }
        else
        {
            PermissionStatus RequestStatus = await Permissions.RequestAsync<Permissions.StorageRead>();
        }

Best Regards,

Leon Lu

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