通过usp端口打印并连接到Zebra

Question

我想通过usb连接到zebra pribter并打印一些内容。但是，当我单击按钮打印时，什么也没发生。我看到我的设备连接到了打印机，我看到了：

 mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
        mDeviceList = mUsbManager.getDeviceList();

        if (mDeviceList.size() > 0) {
            mDeviceIterator = mDeviceList.values().iterator();

            Toast.makeText(this, "Device List Size: " + String.valueOf(mDeviceList.size()), Toast.LENGTH_SHORT).show();

            TextView textView = (TextView) findViewById(R.id.usbDevice);
            String usbDevice = "";
            while (mDeviceIterator.hasNext()) {
                UsbDevice usbDevice1 = mDeviceIterator.next();
                usbDevice += "\n" +
                        "DeviceID: " + usbDevice1.getDeviceId() + "\n" +
                        "DeviceName: " + usbDevice1.getDeviceName() + "\n" +
                        "Protocol: " + usbDevice1.getDeviceProtocol() + "\n" +
//                        "Product Name: " + usbDevice1.getProductName() + "\n" +
//                        "Manufacturer Name: " + usbDevice1.getManufacturerName() + "\n" +
                        "DeviceClass: " + usbDevice1.getDeviceClass() + " - " + translateDeviceClass(usbDevice1.getDeviceClass()) + "\n" +
                        "DeviceSubClass: " + usbDevice1.getDeviceSubclass() + "\n" +
                        "VendorID: " + usbDevice1.getVendorId() + "\n" +
                        "ProductID: " + usbDevice1.getProductId() + "\n";

                int interfaceCount = usbDevice1.getInterfaceCount();
                Toast.makeText(this, "INTERFACE COUNT: " + String.valueOf(interfaceCount), Toast.LENGTH_SHORT).show();

                mDevice = usbDevice1;

                Toast.makeText(this, "Device is attached", Toast.LENGTH_SHORT).show();
                textView.setText(usbDevice);
            }

            mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
            IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
            registerReceiver(mUsbReceiver, filter);

            mUsbManager.requestPermission(mDevice, mPermissionIntent);
        } else {
            Toast.makeText(this, "Please attach printer via USB", Toast.LENGTH_SHORT).show();
        }



       private void print(final UsbDeviceConnection connection, final UsbInterface usbInterface) {
            final String test = ed_txt.getText().toString() + "\n\n";
            testBytes = test.getBytes();

            if (usbInterface == null) {
                Toast.makeText(this, "INTERFACE IS NULL", Toast.LENGTH_SHORT).show();
            } else if (connection == null) {
                Toast.makeText(this, "CONNECTION IS NULL", Toast.LENGTH_SHORT).show();
            } else if (forceCLaim == null) {
                Toast.makeText(this, "FORCE CLAIM IS NULL", Toast.LENGTH_SHORT).show();
            } else {

                connection.claimInterface(usbInterface, forceCLaim);

                Thread thread = new Thread(new Runnable() {
                    @Override
                    public void run() {

                        byte[] cut_paper = {0x1D, 0x56, 0x41, 0x10};
                        connection.bulkTransfer(mEndPoint, testBytes, testBytes.length, 0);
                        connection.bulkTransfer(mEndPoint, cut_paper, cut_paper.length, 0);
                    }
                });


   thread.run();
            }
        }

我已连接到设备，但是当我单击按钮打印后，该按钮无法打印时，我不知道自己做错了什么