code: public void addPort(String portId) {
      if (RuntimeEnvironment.getApiLevel() >= Build.VERSION_CODES.Q) {
        usbPorts.put(
            (UsbPort) createUsbPort(realUsbManager, portId, UsbPortStatus.MODE_DUAL),
            (UsbPortStatus) createUsbPortStatus(
                UsbPortStatus.MODE_DUAL,
                UsbPortStatus.POWER_ROLE_SINK,
                UsbPortStatus.DATA_ROLE_DEVICE,
                0));
        return;
      }
  
      usbPorts.put(
          callConstructor(UsbPort.class,
              from(String.class, portId),
              from(int.class, getStaticField(UsbPort.class, "MODE_DUAL"))),
          (UsbPortStatus) createUsbPortStatus(
              getStaticField(UsbPort.class, "MODE_DUAL"),
              getStaticField(UsbPort.class, "POWER_ROLE_SINK"),
              getStaticField(UsbPort.class, "DATA_ROLE_DEVICE"),
              0));
    }
docs: Adds a USB port to UsbManager.