通过蓝牙传输数据与Socket类似。在网络中使用Socket和ServerSocket控制客户端和服务端的数据读写。而蓝牙通讯也由客户端和服务端Socket来完成。蓝牙客户端Socket是BluetoothSocket，蓝牙服务端Socket是BluetoothServerSocket。这两个类都在android.bluetooth包中。(Data transmission through Bluetooth is similar to Socket. Using Socket and ServerSocket to control data reading and writing of client and server in network. And Bluetooth communication is also completed by client and server Socket. Bluetooth client Socket is BluetoothSocket, Bluetooth server Socket is BluetoothServerSocket. These two classes are all in the android.bluetooth package.)