I am working on an network discovery demo where I want to discovery machines which are running udp service. (Connected to a single wifi). I am using following code
public class DnssdDiscovery extends Activity {
android.net.wifi.WifiManager.MulticastLock lock;
android.os.Handler handler = new android.os.Handler();
ListView mListView;
ArrayList<String> new_conn_list;
DeviceListCustomAdapter new_conn_adapter;
ProgressDialog pbdnssd = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
mListView = (ListView) findViewById(R.id.listView);
new_conn_list = new ArrayList<String>();
new_conn_adapter = new DeviceListCustomAdapter(getApplicationContext(),
new_conn_list);
mListView.setAdapter(new_conn_adapter);
pbdnssd = new ProgressDialog(DnssdDiscovery.this);
pbdnssd.setCanceledOnTouchOutside(false);
pbdnssd.setMessage("Loading...");
/* handler.postDelayed(new Runnable() {
public void run() {
setUp();
}
}, 1000);*/
} /** Called when the activity is first created. */
private String type = "_Controller._udp.local.";
private JmDNS jmdns = null;
private ServiceListener listener = null;
private ServiceInfo serviceInfo;
@SuppressLint("NewApi")
private void setUp() {
android.net.wifi.WifiManager wifi = (android.net.wifi.WifiManager) getSystemService(android.content.Context.WIFI_SERVICE);
lock = wifi.createMulticastLock("mylockthereturn");
lock.setReferenceCounted(true);
lock.acquire();
try {
jmdns = JmDNS.create();
jmdns.addServiceListener(type, listener = new ServiceListener() {
@Override
public void serviceResolved(ServiceEvent ev) {
notifyUser(ev.getInfo().getName().toString() );
}
@Override
public void serviceRemoved(ServiceEvent ev) {
//notifyUser("Service removed: " + ev.getName());
}
@Override
public void serviceAdded(ServiceEvent event) {
// Required to force serviceResolved to be called again (after the first search)
jmdns.requestServiceInfo(event.getType(), event.getName(), 1);
}
});
serviceInfo = ServiceInfo.create("_Controller._udp.local.", "AndroidTest", 65534, "plain test service from android");
jmdns.registerService(serviceInfo);
} catch (IOException e) {
e.printStackTrace();
return;
}
}
public void clickDiscover(View v) {
if (isConnectingToInternet()) {
/*handler.postDelayed(new Runnable() {
public void run() {
setUp();
}
}, 1000);*/
if (!pbdnssd.isShowing())
pbdnssd.show();
new_conn_adapter.clearAll();
handler.postDelayed(new Runnable() {
public void run() {
setUp();
}
}, 1000);
v.setEnabled(false);
((Button) findViewById(R.id.stop_btn)).setEnabled(true);
}else {
Toast.makeText(getApplicationContext(), "Network Error",
Toast.LENGTH_SHORT).show();
}
}
@SuppressLint("NewApi")
public void clickStop(View v){
((Button) findViewById(R.id.discover_btn)).setEnabled(true);
if (jmdns != null) {
if (listener != null) {
jmdns.removeServiceListener(type, listener);
listener = null;
}
jmdns.unregisterAllServices();
try {
jmdns.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
jmdns = null;
}
//repo.stop();
//s.stop();
try {
lock.release();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void notifyUser(final String msg) {
handler.postDelayed(new Runnable() {
public void run() {
String itemName = msg;
new_conn_adapter.add(itemName);
new_conn_adapter.notifyDataSetChanged();
if(pbdnssd.isShowing())
pbdnssd.dismiss();
}
}, 1);
}
@Override
protected void onStart() {
super.onStart();
//new Thread(){public void run() {setUp();}}.start();
}
@SuppressLint("NewApi")
@Override
protected void onStop() {
if (jmdns != null) {
if (listener != null) {
jmdns.removeServiceListener(type, listener);
listener = null;
}
jmdns.unregisterAllServices();
try {
jmdns.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
jmdns = null;
}
//repo.stop();
//s.stop();
try {
lock.release();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
super.onStop();
}
public boolean isConnectingToInternet() {
ConnectivityManager connectivity = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
return false;
}
}
Main thing is I am not sure on service type i am using is correct. 1) What is service type of UDP service? 2) Is it possible to search udp service using android device? 3) Is there any other example regarding this?
