Android 4.0引入了一项很重要的技术就是 WiFiDirect (WiFi直连) ，它可以让WiFi设备无需热点即可实现两个WiFi设备的P2P数据交换。-Android 4.0 introduces a very important technology is WiFiDirect (WiFi Direct Connect), which allows WiFi devices without WiFi hotspots can be achieved two devices P2P