在Android卓悦执行 [英] Bonjour implementation on Android

问题描述

我想实现我的Andr​​oid应用程序卓悦/零的conf。我使用jmDns库中搜索所有可用的设备。下面是我使用的搜索在同一网络中的设备的code：

I am trying to implement bonjour/zero conf on my android app. I am using jmDns library for searching the all the available devices. Here is the code that I am using for searching the devices in the same network:

public class ListDevices extends ListActivity {
    JmDNS jmdns;
    JmDNSImpl impl;
    MulticastLock lock;
    protected ServiceListener listener;
    protected ServiceInfo info;
    public ListView lv;
    public ArrayList<String> deviceList;
    public int cancel = 0;
    public final static String TAG = "ListDevices";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        deviceList = new ArrayList<String>();
        showAllPrinters();

        setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, deviceList));

        lv = getListView();
        lv.setTextFilterEnabled(true);

        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                       ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
            }
        });
        this.listener = new ServiceListener() {
            public void serviceAdded(ServiceEvent event) {
                deviceList.add("Service added   : " + event.getName() + "."
                        + event.getType());
                Log.v(TAG, "Service added   : " + event.getName() + "."
                        + event.getType());
            }

            public void serviceRemoved(ServiceEvent event) {
                deviceList.add("Service removed : " + event.getName() + "."
                        + event.getType());
                Log.v(TAG, "Service removed : " + event.getName() + "."
                        + event.getType());
            }

            public void serviceResolved(ServiceEvent event) {
                deviceList.add("Service resolved: " + event.getInfo());
                Log.v(TAG, "Service resolved: " + event.getInfo());
            }
        };
    }

    public void showAllPrinters() {
        Log.d("ListDevices", "in showAllPrinters");
        try {

            WifiManager wifi = (WifiManager)
                               getSystemService(Context.WIFI_SERVICE);
            lock = wifi.createMulticastLock("fliing_lock");
            lock.setReferenceCounted(true);
            lock.acquire();

            InetAddress inetAddress = getLocalIpAddress();
            jmdns = JmDNS.create(inetAddress, "TEST");

            ServiceInfo[] infos = jmdns.list("_http._tcp.local.");

            if (infos != null && infos.length > 0) {
                for (int i = 0; i < infos.length; i++) {
                    deviceList.add(infos[i].getName());
                }
            } else {
                deviceList.add("No device found.");
            }
            impl = (JmDNSImpl) jmdns;

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public InetAddress getLocalIpAddress() {
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface
                    .getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = (NetworkInterface) en.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = intf
                        .getInetAddresses(); enumIpAddr.hasMoreElements();) {
                    InetAddress inetAddress = (InetAddress) enumIpAddr
                            .nextElement();
                    if (!inetAddress.isLoopbackAddress()) {
                        return inetAddress;
                    }
                }
            }
        } catch (SocketException ex) {
            Log.e("ListDevices", ex.toString());
        }
        return null;
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (isFinishing()) {
            lock.release();
        }
    }
}

基本上，我加入他们的列表，以便我可以显示所有可用设备的列表。现在，当我运行这个code，我越来越没有异常/不一样的错误。但在另一方面，没有被添加到我的列表[PS：有ATLEAST 5-6 PC和Mac有没有在网络上

Basically, I am adding them in a list so that I can display a list of all available devices. Now when I am running this code, I am getting no exception/nothing like error. But on the other hand, nothing is added to my list [PS: there atleast 5-6 PCs and Macs are there in the network.

我也试图从中得到code名单：

I also tried to get the list from this code:

jmdns.addServiceListener("_http._tcp.local.", listener);

监听器在的onCreate 活动的定义。不过这也没有退还任何设备。

listener is defined in the onCreate of the activity. But this also did not returned any device.

请帮忙，建议我在做什么错在这里。任何帮助AP preciated！

Please help, suggest what I am doing wrong here. Any help is appreciated!

推荐答案

的Andr​​oid 4.1增加了网络服务发现，这似乎是刚刚结束了在不同的方面卓悦栈。我也看到了低级别的API名为<一个href="http://developer.android.com/reference/android/net/wifi/p2p/WifiP2pManager.html">android.net.wifi.p2p.WifiP2pManager一个公开DNS-SD（以及UPnP的？）直接。

Android 4.1 adds Network Service Discovery that seems to be just wrapping up the Bonjour stack in different terms. I also see a lower-level API called android.net.wifi.p2p.WifiP2pManager that exposes DNS-SD (as well as UPnP?) directly.

请注意，底层的mDNSResponder守护进程似乎并不运行所有的时间，而不能用于全系统DNS查找（例如从浏览器），据我可以告诉现在。

Note that the underlying mDNSResponder daemon does not seem to be running all the time, and is not used for systemwide DNS lookups (e.g. from a browser) as far as I can tell right now.

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