如何从Android手机打印PDF到打印机？

Question

我正在尝试将pdf文件作为字节数组发送到打印机，但它是用机器语言打印的。请大家帮忙。我们正在使用hp officejet 100移动打印机，试图通过蓝牙技术进行打印

//发送数据

void sendData() throws IOException {
        try {

            InputStream is = new FileInputStream(new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/invoices.pdf"));// Where this is Activity

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int FILE_CHUNK_SIZE = 1024 * 4;
            byte[] b = new byte[FILE_CHUNK_SIZE];
            int read = -1;



            while ((read = is.read(b)) != -1) {
                bos.write(b, 0, read);
            }

            byte[] bytes = bos.toByteArray();

            mmOutputStream.write(bytes);

            is.close();
            bos.close();
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            myLabel.setText("Data Sent");
            closeBT();
        }

    }