@Nullable
    public static Folder fromFile(final File file, final String subfolders) {

        if (file == null) {
            return null;
        }
        return new Folder(FolderType.FILE, Uri.fromFile(file), 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