android Bluetooth printer does not print Arabic characters (UTF-8)

Question

I have a bluetooth printer and I print english characters from my android app normally, but when I write Arabic characters its print them incorrectly. I try to encode outputstream when write to the printer but no result. this is my code

  Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
                    .getBondedDevices();
            if (pairedDevices.size() > 0) {
                for (BluetoothDevice device : pairedDevices) {


                    if (device.getName().equalsIgnoreCase("BlueTooth Printer")) {
                        mmDevice = device;
                        break;
                    }
                }
            }

this is how i print data:

        void sendData() throws IOException {
        try {

            // the text typed by the user
            String msg = myTextbox.getText().toString();
            msg += "\n";

            mmOutputStream.write(msg.getBytes(Charset.forName("UTF-8")));

            // tell the user data were sent
            myLabel.setText("Data Sent");

        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }