调整屏幕亮度： https://blog.csdn.net/atgcu26/article/details/68593868
外接摄像头调用：https://blog.csdn.net/duolezengjie/article/details/50083539
https://blog.csdn.net/u011186789/article/details/53034241
JSON转换： https://blog.csdn.net/wildstark/article/details/79306950
获取MAC以及IP地址：https://blog.csdn.net/qq_34902522/article/details/78962893
https://blog.csdn.net/chaozhung_no_l/article/details/78329371
