Android获取usb权限的两种方法

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//获取USB设备ACTION
private static final String ACTION_USB_PERMISSION = "com.android.usb.USB_PERMISSION";
//   获取USB设备列表及定位到要申请权限的USB设备
//   mUsbManager = (UsbManager) mContext.getSystemService(Context.USB_SERVICE);
//   HashMap devices = mUsbManager.getDeviceList();
//   List deviceList = new ArrayList();
//   for (UsbDevice device : devices.values()) {
//    if (3540==device.getVendorId() && 567==device.getProductId()) {//获取打印机设备 vid和pid
//     currentDevice=device;
//    }
//   }
//开始申请USB权限
private void getUsbPermission(UsbDevice mUSBDevice) {
  UltraLog.d("开始申请USB权限");
  PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, new Intent(ACTION_USB_PERMISSION), 0);
  IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
  filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
  filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
  mContext.registerReceiver(mUsbReceiver, filter);
  mUsbManager.requestPermission(mUSBDevice, pendingIntent); // 该代码执行后，系统弹出一个对话框/等待权限
//以下代码是因为在系统层将弹出框直接修改掉了，可以不用
//  long start = System.currentTimeMillis();
//  while (!mUsbManager.hasPermission(mUSBDevice)) {
//   long current = System.currentTimeMillis();
//   if ((current - start) > 3500) {
//    break;
//   }
//   try {
//    Thread.sleep(50);
//   } catch (InterruptedException e) {
//    e.printStackTrace();
//   }
//  }
// }

private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
  @SuppressLint("NewApi")
  public void onReceive(Context context, Intent intent) {
   String action = intent.getAction();

   if (ACTION_USB_PERMISSION.equals(action)) {
    synchronized (this) {
     mContext.unregisterReceiver(mUsbReceiver);
     UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
     if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)
       && currentDevice.equals(device)) {
      //TODO 授权成功，操作USB设备
     }else{
      //用户点击拒绝了
     }
    }
   }
  }
 };