CODEWITHSUNDEEP
javaandroidnsd
Amos
Amos

Reputation: 2650

Android NSD (Network Service Discovery) registration listener already in use

Anyone face the same error and can resolve it?

java.lang.IllegalArgumentException: listener already in use at android.net.nsd.NsdManager.registerService(NsdManager.java:485)

NsdServiceInfo serviceInfo = new NsdServiceInfo();
serviceInfo.setServiceName(myServiceName);
serviceInfo.setServiceType(AppConfig.NSD_SERVICE_TYPE);
serviceInfo.setPort(AppConfig.VIDEO_CALL_PORT);
nsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, registrationListener);

...

NsdManager.RegistrationListener registrationListener = new NsdManager.RegistrationListener() {

        @Override
        public void onServiceRegistered(NsdServiceInfo serviceInfo) {
            try {
                // Android may have changed it in order to resolve a conflict, so update the name
                myServiceName = serviceInfo.getServiceName();
                nsdManager.discoverServices(AppConfig.NSD_SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, discoveryListener);
            } catch (Exception e) {
                AppUtil.logErrorBaseOnMode(e);
            }
        }

        @Override
        public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
            // todo
            // Registration failed!  Put debugging code here to determine why.
        }

        @Override
        public void onServiceUnregistered(NsdServiceInfo arg0) {
            // todo
            // Service has been unregistered.  This only happens when you call NsdManager.unregisterService() and pass in this listener.
        }

        @Override
        public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
            // todo
            // Un-registration failed.  Put debugging code here to determine why.
        }
    }

Upvotes: 0

Views: 1767

Answers (1)

Pavel S.
Pavel S.

Reputation: 302

I believe you simply have to use new listener for each registration. Every time you start service registration, you have to create new RegistrationListener object.

Like this:

nsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, new NsdManager.RegistrationListener() {...});

P.S. Same thing must be done for service resolution.

See more info here: docs

Upvotes: 1

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