我正在尝试在我的安卓应用程序中实现Bonjour/Zeroconf功能。我正在使用jmDns库搜索所有可用设备。以下是我用于在同一网络中搜索设备的代码：
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，我正在将它们添加到列表中，以便可以显示所有可用设备的列表。 现在当我运行此代码时，我没有得到任何异常/错误之类的东西。但另一方面，我的列表中没有添加任何内容[附注：至少有5-6个PC和Mac在网络中。
我还尝试从这段代码获取列表：
jmdns.addServiceListener("_http._tcp.local.", listener);
listener在活动的onCreate中定义。但是这样也没有返回任何设备。
请帮忙，建议我在这里做错了什么。非常感谢您的任何帮助！