注冊廣播監聽usb的掛載狀態，過濾 vid 和 pid，以下是源碼：

class IdUsbManager private constructor() {val pid = 50010val vid = 1024private var mIdUSBManagerListener: IdUSBManagerListener? = nullcompanion object {private val mInstance: IdUsbManager by lazy(LazyThreadSafetyMode.SYNCHRONIZED) {IdUsbManager()}fun getInstance() = mInstance}private val usbMgrReceiver: BroadcastReceiver = object : BroadcastReceiver() {override fun onReceive(context: Context, intent: Intent) {val action = intent.actionif (UsbManager.ACTION_USB_DEVICE_ATTACHED == action) {val device =intent.getParcelableExtra<Parcelable>(UsbManager.EXTRA_DEVICE) as UsbDeviceLog.e(this.javaClass.name,"IdUsbManager USB接入 ${device.vendorId} ${device.productId}")if (device.vendorId == vid && device.productId == pid) {//USB接入mIdUSBManagerListener?.let {it.onUSBArrived()}}} else if (UsbManager.ACTION_USB_DEVICE_DETACHED == action) {val device =intent.getParcelableExtra<Parcelable>(UsbManager.EXTRA_DEVICE) as UsbDeviceLog.e(this.javaClass.name,"IdUsbManager USB被拔出 ${device.vendorId} ${device.productId}")if (device.vendorId == vid && device.productId == pid) {//USB被拔出mIdUSBManagerListener?.let {it.onUSBRemoved()}}}}}//注冊監聽fun registerUSBPermissionReceiver(context: Context?): Boolean {context?.let {val filter = IntentFilter()//filter.addAction(ACTION_USB_PERMISSION)filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED)filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED)context!!.registerReceiver(usbMgrReceiver, filter)return true}return false}//移除廣播fun unRegisterUSBPermissionReceiver(context: Context?) {context?.let {it.unregisterReceiver(usbMgrReceiver)}}fun setIdUSBManagerListener(listener: IdUSBManagerListener): IdUsbManager {this.mIdUSBManagerListener = listenerreturn this}interface IdUSBManagerListener {fun onUSBArrived()fun onUSBRemoved()}}

總結

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