private UsbManager usbManager private UsbSerialDriver device protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState) // Get USB manager Android. usbManager = (UsbManager) getSystemService(Context.USB_SERVICE) -private UsbManager usbManager　 private UsbSerialDriver device　　protected void onCreate(Bundle savedInstanceState) {　super.onCreate(savedInstanceState)　 // Get USB manager　Android.　usbManager = (UsbManager) getSystemService(Context.USB_SERVICE)