Bei der Verwendung der Netzwerkdienst-Erkennung schlägt die Registrierung mit Fehlercode 0 fehl.

Question

Immer wenn ich registerService Funktion verwende, gibt es eine Ausnahme mit Code Fehler 0. 1) Ich erstelle eine lokale Chat-Service-App, wo ich lokalen Service Broadcast haben muss und dabei bin ich fest, egal was ich do, Registrierung schlägt immer mit Fehlercode 0 fehl. Ich habe keine Mehrfachregistrierungsinstanzen in onResume() oder onPause() blockiert. 2) Logcat zeigt nichts anderes als

Es wurde versucht, ein Eingabeereignis zu beenden, aber der Eingabeereignisempfänger wurde bereits verworfen.

immer wenn ich auf Register Service-Taste oben rechts Ecke klicken.

Dies ist mein Code:

public String mServiceName = "nearByDevices"; 
NsdServiceInfo mService; 
/** 
* ATTENTION: This was auto-generated to implement the App Indexing API. 
* See https://g.co/AppIndexing/AndroidStudio for more information. 
*/ 
private GoogleApiClient client; 

    public void registerService(int port) { 
    // Create the NsdServiceInfo object, and populate it. 
     // Cancel any previous registration request 
     initializeRegistrationListener(); 
     NsdServiceInfo serviceInfo = new NsdServiceInfo(); 
     serviceInfo.setServiceName(mServiceName); 
     serviceInfo.setServiceType(SERVICE_TYPE); 

    serviceInfo.setPort(port); 
     NsdHelper(this); 
     mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE); 
     mNsdManager.registerService(serviceInfo,NsdManager.PROTOCOL_DNS_SD, mRegistrationListener); 


} 
public void NsdHelper(Context context) { 
    mContext = context; 
    mNsdManager = (NsdManager) context.getSystemService(Context.NSD_SERVICE); 
} 



public void initializeRegistrationListener() { 
    mRegistrationListener = new NsdManager.RegistrationListener() { 
     @Override 
     public void onServiceRegistered(NsdServiceInfo NsdServiceInfo) { 
      mServiceName = NsdServiceInfo.getServiceName(); 
      Toast.makeText(MainActivity.this, "Service registered:" + mServiceName, Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     public void onRegistrationFailed(NsdServiceInfo arg0, int arg1) { 
      Toast.makeText(MainActivity.this, "Service registration failed:" + arg1, Toast.LENGTH_LONG).show(); 
     } 
     @Override 
     public void onServiceUnregistered(NsdServiceInfo arg0) { 
      Toast.makeText(MainActivity.this, "Service unregistered:" + arg0.getServiceName(), Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) { 
      Toast.makeText(MainActivity.this, "Service unregistration failed:" + errorCode, Toast.LENGTH_LONG).show(); 
     } 
    }; 
} 
public void initializeDiscoveryListener() { 

    // Instantiate a new DiscoveryListener 
    mDiscoveryListener = new NsdManager.DiscoveryListener() { 

     // Called as soon as service discovery begins. 
     @Override 
     public void onDiscoveryStarted(String regType) { 
      Toast.makeText(MainActivity.this, "Service Discovery Started", Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     public void onServiceFound(NsdServiceInfo service) { 
      // A service was found! Do something with it. 
      Toast.makeText(MainActivity.this, "Service Discovery Success:" + service.getServiceName(), Toast.LENGTH_LONG).show(); 
      if (!service.getServiceType().equals(SERVICE_TYPE)) { 
       // Service type is the string containing the protocol and 
       // transport layer for this service. 
       Toast.makeText(MainActivity.this, "Unknown Service Type" + service.getServiceType(), Toast.LENGTH_LONG).show(); 
      } else if (service.getServiceName().equals(mServiceName)) { 

       Toast.makeText(MainActivity.this, "Same Machine" + mServiceName, Toast.LENGTH_LONG).show(); 
      } else { 
       devices.add((service.getServiceName()).toString());    } 
     } 
     @Override 
     public void onServiceLost(NsdServiceInfo service) { 
      Toast.makeText(MainActivity.this, "Service Lost:" + service.getServiceName(), Toast.LENGTH_LONG).show(); 
      if (mService == service) { 
       mService = null; 
      } 
     } 
     @Override 
     public void onDiscoveryStopped(String serviceType) { 
      Toast.makeText(MainActivity.this, "Discovery Stopped" + serviceType, Toast.LENGTH_LONG).show(); 
     } 
     @Override 
     public void onStartDiscoveryFailed(String serviceType, int errorCode) { 
      Toast.makeText(MainActivity.this, "Discovery failed. Error Code" + errorCode, Toast.LENGTH_LONG).show(); 
     } 
     @Override 
     public void onStopDiscoveryFailed(String serviceType, int errorCode) { 
      Toast.makeText(MainActivity.this, "Discovery failed. Error Code" + errorCode, Toast.LENGTH_LONG).show(); 
     } 
    }; 
} 
     public void initializeResolveListener() { 
      mResolveListener = new NsdManager.ResolveListener() { 

       @Override 
       public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) { 
        // Called when the resolve fails. Use the error code to debug. 
        Log.e(TAG, "Resolve failed" + errorCode); 
       } 

       @Override 
       public void onServiceResolved(NsdServiceInfo serviceInfo) { 
        Log.e(TAG, "Resolve Succeeded. " + serviceInfo); 

        if (serviceInfo.getServiceName().equals(mServiceName)) { 
         Log.d(TAG, "Same IP."); 
         return; 
        } 
        mService = serviceInfo; 
        int port = mService.getPort(); 
        InetAddress host = mService.getHost(); 
       } 



    }; 
} 
    public void discoverServices() { 
    stopDiscovery(); // Cancel any existing discovery request 
    initializeDiscoveryListener(); 
    mNsdManager.discoverServices(
      SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener); 
} 
public void stopDiscovery() { 
    if (mDiscoveryListener != null) { 
     try { 
      mNsdManager.stopServiceDiscovery(mDiscoveryListener); 
     } finally { 
     } 
     mDiscoveryListener = null; 
    } 
} public NsdServiceInfo getChosenServiceInfo() { 
    return mService; 
} 
public void tearDown() { 
    if (mRegistrationListener != null) { 
     try { 
      mNsdManager.unregisterService(mRegistrationListener); 
     } finally { 
     } 
     mRegistrationListener = null; 
    } 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    //initializeServerSocket(); 
    devices = new ArrayList<String>(); 


    ArrayAdapter adapter = new ArrayAdapter(this, R.layout.main_listview, devices); 
    ListView listView = (ListView) findViewById(R.id.device_list); 
    if(devices.isEmpty()) { 
    devices.add("No Devices Nearby"); 
     listView.setAdapter(adapter); 
    } 
    else 
    listView.setAdapter(adapter); 
    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 

} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    switch (id) { 
     case R.id.register: 
      // initializeServerSocket(); 
      registerService(65010); 
      return true; 
     case R.id.discover: 
      discoverServices(); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
    } 


} 

@Override 
public void onStart() { 
    super.onStart(); 

    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    client.connect(); 
    Action viewAction = Action.newAction(
      Action.TYPE_VIEW, // TODO: choose an action type. 
      "Main Page", // TODO: Define a title for the content shown. 
      // TODO: If you have web page content that matches this app activity's content, 
      // make sure this auto-generated web page URL is correct. 
      // Otherwise, set the URL to null. 
      Uri.parse("http://host/path"), 
      // TODO: Make sure this auto-generated app deep link URI is correct. 
      Uri.parse("android-app://com.example.devesh1.mynewapp/http/host/path") 
    ); 
    AppIndex.AppIndexApi.start(client, viewAction); 
} 

@Override 
public void onStop() { 
    super.onStop(); 

    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    Action viewAction = Action.newAction(
      Action.TYPE_VIEW, // TODO: choose an action type. 
      "Main Page", // TODO: Define a title for the content shown. 
      // TODO: If you have web page content that matches this app activity's content, 
      // make sure this auto-generated web page URL is correct. 
      // Otherwise, set the URL to null. 
      Uri.parse("http://host/path"), 
      // TODO: Make sure this auto-generated app deep link URI is correct. 
      Uri.parse("android-app://com.example.devesh1.mynewapp/http/host/path") 
    ); 
    AppIndex.AppIndexApi.end(client, viewAction); 
    client.disconnect(); 
} 

} 

Answer 1

ich dieses Problem hatte bei dem Versuch, einen Dienst zu registrieren und die NsdManager verwenden. Am Ende fand ich heraus, dass der Diensttyp sich an das Format halten muss, das als Beispiel in der NsdManager documentation beschrieben wird. Um zu klären, ist das Format: "_name._communicationprotocol" zB .: "_ipp._tcp" und „_http._tcp Wenn es nicht, es in einem Rückruf führen zu onRegistrationFailed mit errorcode = 0

BTW.. Debug-Protokoll von NsdManager ist nicht auf Logcat als von Ihrer Anwendung ausgegeben Sie müssen das Protokoll mit „keine Filter“ sehen Debug-Informationen aus dem NSD-Dienst

aktualisieren, um zu sehen:.. Gerade stolperte in diesen Fehler wieder gesucht für _name._tcp.local jedoch sollte ich nur nach _name._tcp suchen