private fun initUsbReceiver() {
        val filter = IntentFilter()
        filter.addAction("android.hardware.usb.action.USB_STATE")
        mUsbBroadcastReceiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context, intent: Intent) {
                val action = intent.action
                if (action == "android.hardware.usb.action.USB_STATE") {
                    val connected = intent.extras.getBoolean("connected")
                    if (connected) {
                        Toast.makeText(this@UsbActivity, "USB已连接", Toast.LENGTH_SHORT).show()
                    } else {
                        Toast.makeText(this@UsbActivity, "USB已断开", Toast.LENGTH_SHORT).show()
                    }
                }
            }
        }
        registerReceiver(mUsbBroadcastReceiver, filter)
    }

    private fun unregisterUsbReceiver() {
        unregisterReceiver(mUsbBroadcastReceiver)
    }

    private fun initUsbDeviceReceiver() {
        val filter = IntentFilter()
        filter.addAction("android.hardware.usb.action.USB_DEVICE_ATTACHED")
        filter.addAction("android.hardware.usb.action.USB_DEVICE_DETACHED")
        mUsbBroadcastReceiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context, intent: Intent) {
                val action = intent.action
                if (action == "android.hardware.usb.action.USB_DEVICE_ATTACHED") {
                    val usbManager: UsbManager = getSystemService(Context.USB_SERVICE) as UsbManager
                    val deviceList = usbManager.deviceList
                    Log.e("zh", "设备连接 设备数目：${deviceList.size}")
                    deviceList.forEach { Log.e("zh", " 设备：${it}") }
                }
                if (action == "android.hardware.usb.action.USB_DEVICE_DETACHED") {
                    val usbManager: UsbManager = getSystemService(Context.USB_SERVICE) as UsbManager
                    val deviceList = usbManager.deviceList
                    Log.e("zh", "设备断开 设备数目：${deviceList.size}")
                    deviceList.forEach { Log.e("zh", " 设备：${it}") }
                }
            }
        }
        registerReceiver(mUsbBroadcastReceiver, filter)
    }

    private fun unregisterUsbDeviceReceiver() {
        unregisterReceiver(mUsbBroadcastReceiver)
    }

    private val mInputManager by lazy { getSystemService(Context.INPUT_SERVICE) as InputManager }private fun initEnterUsbDeviceReceiver() {
        mInputDeviceListener = object : InputManager.InputDeviceListener {
            override fun onInputDeviceAdded(deviceId: Int) {
                val device = mInputManager.getInputDevice(deviceId)
                Log.e("zh", "onInputDeviceAdded: ${device.name}")

            }

            override fun onInputDeviceRemoved(deviceId: Int) {

            }

            override fun onInputDeviceChanged(deviceId: Int) {

            }

        }
        mInputManager.registerInputDeviceListener(mInputDeviceListener, null)

    }

    private fun unregisterEnterUsbDeviceReceiver() {
        mInputManager.unregisterInputDeviceListener(mInputDeviceListener)
    }