@Nullable
    public static Folder fromDocumentUri(final Uri uri, final String subfolders) {

        if (uri == null) {
            return null;
        }
        return new Folder(FolderType.DOCUMENT, uri, null, toFolderNames(subfolders));
    }
Returns a representation of this folder's location fit to show to an end user. This value is volatile if this folder's type is volatile (e.g. {@link FolderType#PERSISTABLE_FOLDER})
main/src/main/java/cgeo/geocaching/storage/Folder.java