Impresión Uso del problema con el cable USB

Estoy usando código siguiente para imprimir a través del dispositivo androide con el cable USB conectado a mi impresora Samsung.

Cuando uso el método startPrinting me da la siguiente verificación en el registro de depuración:

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1. Comando a la impresora enviada correctamente
2. Permiso de la impresora concedida.

Y la impresora incluso empieza a sonar, pero los datos que proporciono no se imprimen. Estoy atascado en esta etapa y no he encontrado ninguna ayuda de google o stackoverflow tampoco.

Nota: No hay ningún fallo ni error

Estoy probando este código en Android Jelly bean 4.3 OS

Cualquier ayuda sería apreciada.

 private UsbManager mUsbManager; private UsbDevice mDevice; private UsbDeviceConnection mConnection; private UsbInterface mInterface; private UsbEndpoint mEndPoint; private PendingIntent mPermissionIntent; private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION"; private static Boolean forceCLaim = true; HashMap<String, UsbDevice> mDeviceList; Iterator<UsbDevice> mDeviceIterator; int protocol; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE); mDeviceList = mUsbManager.getDeviceList(); mDeviceIterator = mDeviceList.values().iterator(); Button print = (Button) findViewById(R.id.buttonPrint); Toast.makeText(this, "Device List Size: " + String.valueOf(mDeviceList.size()), Toast.LENGTH_SHORT).show(); TextView textView = (TextView) findViewById(R.id.usbDevice); String usbDevice = ""; // This is just testing what devices are connected while (mDeviceIterator.hasNext()) { UsbDevice usbDevice1 = mDeviceIterator.next(); usbDevice += "\n" + "DeviceID: " + usbDevice1.getDeviceId() + "\n" + "DeviceName: " + usbDevice1.getDeviceName() + "\n" + "DeviceClass: " + usbDevice1.getDeviceClass() + " - " + translateDeviceClass(usbDevice1.getDeviceClass()) + "\n" + "DeviceSubClass: " + usbDevice1.getDeviceSubclass() + "\n" + "VendorID: " + usbDevice1.getVendorId() + "\n" + "ProductID: " + usbDevice1.getProductId() + "\n"; protocol = usbDevice1.getDeviceProtocol(); int interfaceCount = usbDevice1.getInterfaceCount(); Toast.makeText(this, "INTERFACE COUNT: " + String.valueOf(interfaceCount), Toast.LENGTH_SHORT).show(); mDevice = usbDevice1; if (mDevice == null) { Toast.makeText(this, "mDevice is null", Toast.LENGTH_SHORT).show(); } else { // Toast.makeText(this, "mDevice is not null", Toast.LENGTH_SHORT).show(); } textView.setText(usbDevice); } if (mDevice == null) { Toast.makeText(this, "mDevice is null", Toast.LENGTH_SHORT).show(); } else { // Toast.makeText(this, "mDevice is not null", Toast.LENGTH_SHORT).show(); } print.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mPermissionIntent = PendingIntent.getBroadcast(MainActivity.this, 0, new Intent(ACTION_USB_PERMISSION), 0); IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION); registerReceiver(mUsbReceiver, filter); if (mDevice != null) mUsbManager.requestPermission(mDevice, mPermissionIntent); // else // Toast.makeText(this, "USB ", Toast.LENGTH_SHORT).show(); // print(mConnection, mInterface); } }); } private String translateDeviceClass(int deviceClass) { switch (deviceClass) { case UsbConstants.USB_CLASS_APP_SPEC: return "Application specific USB class"; case UsbConstants.USB_CLASS_AUDIO: return "USB class for audio devices"; case UsbConstants.USB_CLASS_CDC_DATA: return "USB class for CDC devices (communications device class)"; case UsbConstants.USB_CLASS_COMM: return "USB class for communication devices"; case UsbConstants.USB_CLASS_CONTENT_SEC: return "USB class for content security devices"; case UsbConstants.USB_CLASS_CSCID: return "USB class for content smart card devices"; case UsbConstants.USB_CLASS_HID: return "USB class for human interface devices (for example, mice and keyboards)"; case UsbConstants.USB_CLASS_HUB: return "USB class for USB hubs"; case UsbConstants.USB_CLASS_MASS_STORAGE: return "USB class for mass storage devices"; case UsbConstants.USB_CLASS_MISC: return "USB class for wireless miscellaneous devices"; case UsbConstants.USB_CLASS_PER_INTERFACE: return "USB class indicating that the class is determined on a per-interface basis"; case UsbConstants.USB_CLASS_PHYSICA: return "USB class for physical devices"; case UsbConstants.USB_CLASS_PRINTER: return "USB class for printers"; case UsbConstants.USB_CLASS_STILL_IMAGE: return "USB class for still image devices (digital cameras)"; case UsbConstants.USB_CLASS_VENDOR_SPEC: return "Vendor specific USB class"; case UsbConstants.USB_CLASS_VIDEO: return "USB class for video devices"; case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER: return "USB class for wireless controller devices"; default: return "Unknown USB class!"; } } // Broadcast receiver to obtain permission from user for connection private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (ACTION_USB_PERMISSION.equals(action)) { synchronized (this) { UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE); if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { if (device != null) { // call method to set up device communication mInterface = device.getInterface(0); mEndPoint = mInterface.getEndpoint(0); mConnection = mUsbManager.openDevice(device); Log.i("Info", "Device permission granted"); startPrinting(device); // setup(); } } else { // Log.d("SUB", "permission denied for device " + device); Toast.makeText(context, "PERMISSION DENIED FOR THIS DEVICE", Toast.LENGTH_SHORT).show(); } } } } }; public void startPrinting(final UsbDevice printerDevice) { Handler handler = new Handler(); handler.post(new Runnable() { UsbDeviceConnection conn; UsbInterface usbInterface; @Override public void run() { try { Log.i("Info", "Bulk transfer started"); // usbInterface = printerDevice.getInterface(0); for (int i = 0; i < printerDevice.getInterfaceCount(); i++) { usbInterface = printerDevice.getInterface(i); if (usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_PRINTER) { // usbInterface = mDevice; } } UsbEndpoint endPoint = usbInterface.getEndpoint(0); conn = mUsbManager.openDevice(mDevice); conn.claimInterface(usbInterface, true); String myStringData = "TEXT"; myStringData += "\n"; byte[] array = myStringData.getBytes(); ByteBuffer output_buffer = ByteBuffer.allocate(array.length); UsbRequest request = new UsbRequest(); request.initialize(conn, endPoint); request.queue(output_buffer, array.length); if (conn.requestWait() == request) { Log.i("Info", output_buffer.getChar(0) + ""); Message m = new Message(); m.obj = output_buffer.array(); output_buffer.clear(); } else { Log.i("Info", "No request recieved"); } int transfered = conn.bulkTransfer(endPoint, myStringData.getBytes(), myStringData.getBytes().length, 5000); Log.i("Info", "Amount of data transferred : " + transfered); } catch (Exception e) { Log.e("Exception", "Unable to transfer bulk data"); e.printStackTrace(); } finally { try { conn.releaseInterface(usbInterface); Log.i("Info", "Interface released"); conn.close(); Log.i("Info", "Usb connection closed"); unregisterReceiver(mUsbReceiver); Log.i("Info", "Brodcast reciever unregistered"); } catch (Exception e) { Log.e("Exception", "Unable to release resources because : " + e.getMessage()); e.printStackTrace(); } } } }); } private void print(UsbDeviceConnection connection, UsbInterface intrface) { String test = "THIS IS A PRINT TEST"; // String text = "#move " + protocol + ";" + "#print" + test; // Log.e("text", text); byte[] testBytes = test.getBytes(); if (intrface == null) { Toast.makeText(this, "INTERFACE IS NULL", Toast.LENGTH_SHORT).show(); } if (connection == null) { Toast.makeText(this, "CONNECTION IS NULL", Toast.LENGTH_SHORT).show(); } if (forceCLaim == null) { Toast.makeText(this, "FORCE CLAIM IS NULL", Toast.LENGTH_SHORT).show(); } connection.claimInterface(intrface, forceCLaim); connection.bulkTransfer(mEndPoint, testBytes, testBytes.length, 0); connection.close(); }