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我试图找出在一个范围内（IE 192.168.5.0-192.168.5.255）循环所有 ips 以找到正在侦听给定端口的设备的最佳方法。以下代码正在运行，但我担心我找不到所有设备，因为我的套接字上的超时太低了。第 22 个问题是我希望它超级快，但如果我超时，它开始需要永远。

private class findNetworkDevices extends AsyncTask<String, Integer, String> {

    private String source;
    private Activity activity;
    private Context context;
    public findNetworkDevices(Activity activity) {
        this.activity = activity;
        context = activity;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... params) {
        for (int dest = 0; dest < 255; dest++) {
            String host = "192.168.5." + dest; // TODO: add net address instead of hardcoding
            try {
                Socket s = new Socket();
                s.connect(new InetSocketAddress(InetAddress.getByName(host), 9999), 50);
                Log.v(LOG_TAG, "conn:" + s.toString());
                if (s.isConnected()) {
                    Log.v(LOG_TAG, "connected " + host);
                    foundDevicesArray.add(host);
                } else {
                    return "failed";
                }
            } catch (Exception e) {
                Log.e(LOG_TAG, "Not found", e);
            }
            }
            Log.v(LOG_TAG, "end");

            return "All Done!";
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            ListView lv = (ListView) activity.findViewById(R.id.foundDevicesList);
            ((BaseAdapter) lv.getAdapter()).notifyDataSetChanged();

        }
    }

提前致谢。

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1 回答 1

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I went away from using Async because it took so long. I went with ExecutorService

        ExecutorService executor = Executors.newFixedThreadPool(NB_THREADS);
    String ip = getLocalIpAddress();
    int endIndex = ip.lastIndexOf(".");
    String subnet = ip.substring(0, endIndex);
    for (int dest = 0; dest < 255; dest++) {
        String host = subnet + "." + dest;
        executor.execute(pingRunnable(host));
    }

It seems to spawn multiple threads where Async did it in the background but only in one thread.

于 2013-02-28T21:37:00.627 回答