How can I print PDF from android phone to the printer?

Question

I am trying to send pdf file to printer as a array of bytes but it is printing in machinary language. Please can anyOne help on this. We are using hp officejet 100 mobile printer, Trying to print via bluetooth tech

//send data

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();
        }

    }