How to use

getDeviceProtocol

method

in

android.hardware.usb.UsbDevice

public UsbDeviceAssert hasDeviceProtocol(int protocol) {
 isNotNull();
 int actualProtocol = actual.getDeviceProtocol();
 assertThat(actualProtocol) //
   .overridingErrorMessage("Expected device protocol <%s> but was <%s>.", protocol,
     actualProtocol) //
   .isEqualTo(protocol);
 return this;
}

public UsbDeviceAssert hasDeviceProtocol(int protocol) {
 isNotNull();
 int actualProtocol = actual.getDeviceProtocol();
 assertThat(actualProtocol) //
   .overridingErrorMessage("Expected device protocol <%s> but was <%s>.", protocol,
     actualProtocol) //
   .isEqualTo(protocol);
 return this;
}

if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action) && device.getDeviceProtocol() ==1) {          
  Toast.makeText(context, "监听到usb摄像头变动1"+device.getDeviceProtocol(), Toast.LENGTH_LONG).show();
  usbcameraConnect = false;    
  closeCamera(0);   		 
} else if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action) && device.getDeviceProtocol()==1) {
  Toast.makeText(context, "监听到usb摄像头变动0"+device.getDeviceProtocol(), Toast.LENGTH_LONG).show();
  try {
    Thread.sleep(500);

static public boolean isG4Connected(Context c){
  UsbManager manager = (UsbManager) c.getSystemService(Context.USB_SERVICE);
  HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
  Log.i("USB DEVICES = ", deviceList.toString());
  Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
  Log.i("USB DEVICES = ", String.valueOf(deviceList.size()));
  while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();
    if (device.getVendorId() == 8867 && device.getProductId() == 71
        && device.getDeviceClass() == 2 && device.getDeviceSubclass() ==0
        && device.getDeviceProtocol() == 0){
      Log.i("CALIBRATION-CHECK-IN: ", "Dexcom Found!");
      return true;
    }
  }
  return false;
}

static public boolean isG4Connected(Context c){
  UsbManager manager = (UsbManager) c.getSystemService(Context.USB_SERVICE);
  HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
  Log.i("USB DEVICES = ", deviceList.toString());
  Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
  Log.i("USB DEVICES = ", String.valueOf(deviceList.size()));
  while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();
    if (device.getVendorId() == 8867 && device.getProductId() == 71
        && device.getDeviceClass() == 2 && device.getDeviceSubclass() ==0
        && device.getDeviceProtocol() == 0){
      Log.i("CALIBRATION-CHECK-IN: ", "Dexcom Found!");
      return true;
    }
  }
  return false;
}

public UsbDevice findDexcom() {
  Log.i("CALIBRATION-CHECK-IN: ", "Searching for dexcom");
  mUsbManager = (UsbManager) getApplicationContext().getSystemService(Context.USB_SERVICE);
  Log.i("USB MANAGER = ", mUsbManager.toString());
  HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
  Log.i("USB DEVICES = ", deviceList.toString());
  Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
  Log.i("USB DEVICES = ", String.valueOf(deviceList.size()));
  while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();
    if (device.getVendorId() == 8867 && device.getProductId() == 71
        && device.getDeviceClass() == 2 && device.getDeviceSubclass() ==0
        && device.getDeviceProtocol() == 0){
      dexcom = device;
      Log.i("CALIBRATION-CHECK-IN: ", "Dexcom Found!");
      return device;
    } else {
      Log.w("CALIBRATION-CHECK-IN: ", "that was not a dexcom (I dont think)");
    }
  }
  return null;
}

public UsbDevice findDexcom() {
  Log.i("CALIBRATION-CHECK-IN: ", "Searching for dexcom");
  mUsbManager = (UsbManager) getApplicationContext().getSystemService(Context.USB_SERVICE);
  Log.i("USB MANAGER = ", mUsbManager.toString());
  HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
  Log.i("USB DEVICES = ", deviceList.toString());
  Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
  Log.i("USB DEVICES = ", String.valueOf(deviceList.size()));
  while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();
    if (device.getVendorId() == 8867 && device.getProductId() == 71
        && device.getDeviceClass() == 2 && device.getDeviceSubclass() ==0
        && device.getDeviceProtocol() == 0){
      dexcom = device;
      Log.i("CALIBRATION-CHECK-IN: ", "Dexcom Found!");
      return device;
    } else {
      Log.w("CALIBRATION-CHECK-IN: ", "that was not a dexcom (I dont think)");
    }
  }
  return null;
}

/**
 * Enumerate the endpoints and interfaces on the connected device.
 *
 * @param device Device to query.
 * @return String description of the device configuration.
 */
public static String readDevice(UsbDevice device) {
  StringBuilder sb = new StringBuilder();
  sb.append("Device Name: " + device.getDeviceName() + "\n");
  sb.append(String.format(
      "Device Class: %s -> Subclass: 0x%02x -> Protocol: 0x%02x\n",
      nameForClass(device.getDeviceClass()),
      device.getDeviceSubclass(), device.getDeviceProtocol()));
  for (int i = 0; i < device.getInterfaceCount(); i++) {
    UsbInterface intf = device.getInterface(i);
    sb.append(String.format(Locale.US,
        "-- Interface %d Class: %s -> Subclass: 0x%02x -> Protocol: 0x%02x\n",
        intf.getId(),
        nameForClass(intf.getInterfaceClass()),
        intf.getInterfaceSubclass(),
        intf.getInterfaceProtocol()));
    sb.append(String.format(Locale.US, "   -- Endpoint Count: %d\n",
        intf.getEndpointCount()));
  }
  return sb.toString();
}

Log.i(logTag,"constructor: device protocol: " + usbDevice.getDeviceProtocol());
Log.i(logTag,"constructor: device class: " + usbDevice.getDeviceClass()
    + " subclass: " + usbDevice.getDeviceSubclass());

if (matches(device.getDeviceClass(), device.getDeviceSubclass(), device.getDeviceProtocol())) {
  return true;