Finding and sending commands to Star Micronics receipt printer

DetailsActivity.java

// Searching for printer with specified MAC address
private class SearchTask extends AsyncTask<ActiveOrderRealm, Void, ActiveOrderRealm> {
        private List<PortInfo> mPortList;
        private String mMacAddress = "00:11:62:17:19:EF";
        private boolean mFound = false;

        SearchTask() {
            super();
        }

        @Override
        protected ActiveOrderRealm doInBackground(ActiveOrderRealm... activeOrder) {
            try {
                mPortList = StarIOPort.searchPrinter(PrinterSetting.IF_TYPE_BLUETOOTH, getApplicationContext());
            }
            catch (StarIOPortException e) {
                mPortList = new ArrayList<>();
            }

            return activeOrder[0];
        }

        @Override
        protected void onPostExecute(ActiveOrderRealm activeOrder) {
            for (PortInfo info : mPortList) {
                if (info.getMacAddress().equals(mMacAddress)) {
                    String portName = info.getPortName();

                    if (info.getPortName().startsWith(PrinterSetting.IF_TYPE_BLUETOOTH)) {
                        portName = PrinterSetting.IF_TYPE_BLUETOOTH + info.getMacAddress();
                    }

                    PrinterSetting setting = new PrinterSetting(getApplicationContext());
                    setting.write("TSP100", portName, mMacAddress, "", StarIoExt.Emulation.StarGraphic, true);

                    mFound = true;

                    break;
                }
            }

            if (mFound) {
                new SendCommandTask().execute(activeOrder);
            } else {
                Toast.makeText(getApplicationContext(), "No specified mac address found!", Toast.LENGTH_LONG).show();
            }
        }
    }
    
//**********************
// Send commands to found printer
private class SendCommandTask extends AsyncTask<ActiveOrderRealm, Void, Void> {
        // mLogo is never used after refactoring, don't pay attention to it
        private Bitmap mBitmap = null, mLogo = null;

        @Override
        protected void onPreExecute() {
            // helper function that draws the receipt on bitmap canvas
            mBitmap = drawOnImage();
        }

        @Override
        protected Void doInBackground(ActiveOrderRealm... activeOrder) {
            ActiveOrderRealm currentActiveOrder = activeOrder[0];
            byte[] data = null;

            PrinterSetting setting = new PrinterSetting(getApplicationContext());
            StarIoExt.Emulation emulation = setting.getEmulation();

            data = createCommandsImageNew(emulation, mBitmap, mLogo);

            Communication.sendCommands(this, data, setting.getPortName(), setting.getPortSettings(), 10000,
                    getApplicationContext(), mCallback);     // 10000mS!!!

            return null;
        }

        private Communication.SendCallback mCallback = new Communication.SendCallback() {
            @Override
            public void onStatus(boolean result, Communication.Result communicateResult) {

                String msg = "";

                switch (communicateResult) {
                    case Success :
                        msg = "Success!";
                        break;
                    case ErrorOpenPort:
                        msg = "Fail to openPort";
                        break;
                    case ErrorBeginCheckedBlock:
                        msg = "Printer is offline (beginCheckedBlock)";
                        break;
                    case ErrorEndCheckedBlock:
                        msg = "Printer is offline (endCheckedBlock)";
                        break;
                    case ErrorReadPort:
                        msg = "Read port error (readPort)";
                        break;
                    case ErrorWritePort:
                        msg = "Write port error (writePort)";
                        break;
                    default:
                        msg = "Unknown error";
                        break;
                }

                if (!msg.isEmpty())
                    Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
            }
        };
    }
//**********************************

// function that creates commands for printer
public static byte[] createCommandsImageNew(StarIoExt.Emulation emulation, Bitmap bitmap, Bitmap logo) {

        ICommandBuilder builder = StarIoExt.createCommandBuilder(emulation);
        builder.beginDocument();

        builder.appendBitmap(bitmap, false, PrinterSetting.PAPER_SIZE_THREE_INCH, true);

        builder.appendCutPaper(ICommandBuilder.CutPaperAction.FullCutWithFeed);

        builder.endDocument();

        return builder.getCommands();
    }