The result of the registration shouldn't be empty, this is what I get from logcat and the callback of successful registration.
registerService 46518
onServiceRegistered name: mytest, type: null, host: null, port: 0, txtRecord:
Everything is empty, the port 46518 which was generated by the system, the type, the txtrecord.
The following code is from the official guide
private String mServiceName = "mytest";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
// Initialize a server socket on the next available port.
ServerSocket mServerSocket = new ServerSocket(0);
int mLocalPort = mServerSocket.getLocalPort();
registerService(mLocalPort);
} catch (IOException e) {
e.printStackTrace();
}
}
public void registerService(int port) {
Log.i(tag, "registerService " + port);
// Create the NsdServiceInfo object, and populate it.
NsdServiceInfo serviceInfo = new NsdServiceInfo();
// The name is subject to change based on conflicts with other services advertised on the same network.
serviceInfo.setServiceName(mServiceName);
serviceInfo.setServiceType("_mytest._tcp");
serviceInfo.setPort(port);
serviceInfo.setAttribute("info", android.os.Build.MODEL);
NsdManager mNsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);
mNsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
}
NsdManager.RegistrationListener mRegistrationListener = new NsdManager.RegistrationListener() {
@Override
public void onServiceRegistered(NsdServiceInfo nsdServiceInfo) {
// Save the service name. Android may have changed it in order to
// resolve a conflict, so update the name you initially requested
// with the name Android actually used.
mServiceName = nsdServiceInfo.getServiceName();
Log.i(tag, "onServiceRegistered " + nsdServiceInfo);
}
@Override
public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Registration failed! Put debugging code here to determine why.
Log.i(tag, "onRegistrationFailed code " + errorCode + "\n" + serviceInfo);
}
@Override
public void onServiceUnregistered(NsdServiceInfo arg0) {
// Service has been unregistered. This only happens when you call
// NsdManager.unregisterService() and pass in this listener.
Log.i(tag, "onServiceUnregistered " + arg0);
}
@Override
public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Unregistration failed. Put debugging code here to determine why.
Log.i(tag, "onRegistrationFailed code " + errorCode + "\n" + serviceInfo);
}
};
