Android 当我使用itext创建pdf时，如何将古吉拉特文字写入pdf

我想在将html转换为PDF时将古吉拉特语指令写入使用

        com.itextpdf.text.Document document = new Document();
        final PdfWriter pdfWriter = PdfWriter.getInstance
                (document, new FileOutputStream(file.getAbsoluteFile()));
        pdfWriter.setPageEvent(new MyPdfPageEventHelper());
        document.open();
        XMLWorkerHelper worker = XMLWorkerHelper.getInstance();
        InputStream is = new ByteArrayInputStream(report.getBytes(StandardCharsets.UTF_8));
        worker.parseXHtml(pdfWriter, document, is, Charset.forName("UTF-8"));
        document.close();