private void loadSetPreferences() {
    String defaultBTRFIDDevice =
        SharedPreferenceManager.getSharedPreference(
            this,
            SharedPreferenceManager.SP_DEFAULT_BT_RFID_DEVICE_ADDRESS,
            BluetoothHandler.DEFAULT_BT_MAC_ADDRESS);
    String btRFIDDefaultDevName = null;

    btRFIDDefaultDevLP.setValue(defaultBTRFIDDevice);

    if (!defaultBTRFIDDevice.equals(BluetoothHandler.DEFAULT_BT_MAC_ADDRESS)) {
      if (pairedBTDeviceAddresses != null && pairedBTDeviceNames != null) {
        for (int i = 0; i < pairedBTDeviceAddresses.size(); i++) {
          if (pairedBTDeviceAddresses.get(i).equals(defaultBTRFIDDevice)) {
            btRFIDDefaultDevName = pairedBTDeviceNames.get(i).toString();
          }
        }

        if (btRFIDDefaultDevName
            == null) { // means that the default rfid device is no longer paired with this device.
          // set the default device to no device
          defaultBTRFIDDevice = BluetoothHandler.DEFAULT_BT_MAC_ADDRESS;
          SharedPreferenceManager.setSharedPreference(
              this,
              SharedPreferenceManager.SP_DEFAULT_BT_RFID_DEVICE_ADDRESS,
              BluetoothHandler.DEFAULT_BT_MAC_ADDRESS);

          Log.w(
              TAG,
              "The saved default bluetooth RFID device is no longer paired with this device. Setting the default bluetooth RFID device to nothing");
        }
      }
    }

    btRFIDDefaultDevLP.setValue(defaultBTRFIDDevice);
    if (btRFIDDefaultDevName != null) {
      btRFIDDefaultDevLP.setSummary(btRFIDDefaultDevName);
    } else {
      btRFIDDefaultDevLP.setSummary(getString(R.string.pref_bt_rfid_default_dev_summary));
    }
  }
  @Override
  public boolean onPreferenceChange(Preference preference, Object newValue) {
    if (preference == btRFIDDefaultDevLP) {
      String defaultDeviceAddress = newValue.toString();
      String defaultDeviceName = "";
      for (int i = 0; i < pairedBTDeviceAddresses.size(); i++) {
        if (pairedBTDeviceAddresses.get(i).equals(defaultDeviceAddress)) {
          defaultDeviceName = pairedBTDeviceNames.get(i).toString();
        }
      }

      btRFIDDefaultDevLP.setSummary(defaultDeviceName);
      SharedPreferenceManager.setSharedPreference(
          this, SharedPreferenceManager.SP_DEFAULT_BT_RFID_DEVICE_ADDRESS, defaultDeviceAddress);
    }
    return true;
  }