(Android)如何根据每个设备的IP地址通过互联网建立点对点连接

public String getIPAddress() {
    try {
        List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
        for (NetworkInterface intf : interfaces) {
            List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
            for (InetAddress addr : addrs) {
                if (!addr.isLoopbackAddress() && addr instanceof Inet4Address) {
                    return addr.getHostAddress();
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

public void establishP2PConnection(String ipAddress) {
    try {
        Socket socket = new Socket(ipAddress, 8080);
        // 在这里可以进行数据的发送和接收操作
        socket.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}