static string ResolveDocumentPath(AndroidUri uri)
{
Debug.WriteLine($"Trying to resolve document URI: '{uri}'");
var docId = DocumentsContract.GetDocumentId(uri);
var docIdParts = docId?.Split(':');
if (docIdParts == null || docIdParts.Length == 0)
{
return(null);
}
if (uri.Authority.Equals(UriAuthorityExternalStorage, StringComparison.OrdinalIgnoreCase))
{
Debug.WriteLine($"Resolving external storage URI: '{uri}'");
if (docIdParts.Length == 2)
{
var storageType = docIdParts[0];
var uriPath = docIdParts[1];
// This is the internal "external" memory, NOT the SD Card
if (storageType.Equals(storageTypePrimary, StringComparison.OrdinalIgnoreCase))
{
#pragma warning disable CS0618 // Type or member is obsolete
var root = global::Android.OS.Environment.ExternalStorageDirectory.Path;
#pragma warning restore CS0618 // Type or member is obsolete
return(Path.Combine(root, uriPath));
}
// TODO: support other types, such as actual SD Cards
}
}
else if (uri.Authority.Equals(UriAuthorityDownloads, StringComparison.OrdinalIgnoreCase))
{
Debug.WriteLine($"Resolving downloads URI: '{uri}'");
// NOTE: This only really applies to older Android vesions since the privacy changes
if (docIdParts.Length == 2)
{
var storageType = docIdParts[0];
var uriPath = docIdParts[1];
if (storageType.Equals(storageTypeRaw, StringComparison.OrdinalIgnoreCase))
{
return(uriPath);
}
}
// ID could be "###" or "msf:###"
var fileId = docIdParts.Length == 2
? docIdParts[1]
: docIdParts[0];
foreach (var prefix in contentUriPrefixes)
{
var uriString = prefix + "/" + fileId;
var contentUri = AndroidUri.Parse(uriString);
if (GetDataFilePath(contentUri) is string filePath)
{
return(filePath);
}
}
}
else if (uri.Authority.Equals(UriAuthorityMedia, StringComparison.OrdinalIgnoreCase))
{
Debug.WriteLine($"Resolving media URI: '{uri}'");
if (docIdParts.Length == 2)
{
var storageType = docIdParts[0];
var uriPath = docIdParts[1];
AndroidUri contentUri = null;
if (storageType.Equals(storageTypeImage, StringComparison.OrdinalIgnoreCase))
{
contentUri = MediaStore.Images.Media.ExternalContentUri;
}
else if (storageType.Equals(storageTypeVideo, StringComparison.OrdinalIgnoreCase))
{
contentUri = MediaStore.Video.Media.ExternalContentUri;
}
else if (storageType.Equals(storageTypeAudio, StringComparison.OrdinalIgnoreCase))
{
contentUri = MediaStore.Audio.Media.ExternalContentUri;
}
if (contentUri != null && GetDataFilePath(contentUri, $"{MediaStore.MediaColumns.Id}=?", new[] { uriPath }) is string filePath)
{
return(filePath);
}
}
}
Debug.WriteLine($"Unable to resolve document URI: '{uri}'");
return(null);
}
