如何使用Android查找连接到家庭网络的所有设备？

Question

作为项目的一部分，我正在构建一个映射家庭网络的应用程序，我找到了以下代码，但我找不到所有连接到网络的设备（IP地址）的帮助。

protected String doInBackground(String... aurl) {
    LoopCurrentIP = 0;

    String IPAddress = "";
    String[] myIPArray = aurl[0].split("\\.");
    InetAddress currentPingAddr;

    for (int i = 0; i <= 255; i++) {
        try {
            // build the next IP address
            currentPingAddr = InetAddress.getByName(myIPArray[0] + "." +
                    myIPArray[1] + "." +
                    myIPArray[2] + "." +
                    Integer.toString(LoopCurrentIP));
            IPAddress = currentPingAddr.toString();
            publishProgress(""+(int)((i*100)/255));                         
            Log.d("MyApp",IPAddress);  

            // 50ms Timeout for the "ping"
            if (currentPingAddr.isReachable(1000)) {
                textView.setText(currentPingAddr.toString());
                ret.add(currentPingAddr);

                Log.d("MyApp",IPAddress);                     
            }
        } catch (UnknownHostException ex) {
        } catch (IOException ex) {
        }

        LoopCurrentIP++;
    }

    return null;
}