在两个Android设备之间通信

// 发送端代码
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = bluetoothAdapter.getRemoteDevice("目标设备地址");
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(MY_UUID);
socket.connect();
OutputStream outputStream = socket.getOutputStream();
outputStream.write("Hello, World!".getBytes());
socket.close();

// 接收端代码
BluetoothServerSocket serverSocket = bluetoothAdapter.listenUsingRfcommWithServiceRecord("MyService", MY_UUID);
BluetoothSocket socket = serverSocket.accept();
InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024];
int bytes;
while ((bytes = inputStream.read(buffer)) > 0) {
    String receivedMessage = new String(buffer, 0, bytes);
    Log.d("Bluetooth", "Received: " + receivedMessage);
}
socket.close();
serverSocket.close();