J'ai une application multiplateforme Xamarin et je veux utiliser l'API NetworkServiceDiscovery d'Android.Comment implémenter correctement Xamarin NetworkServiceDiscovery via DependencyService?
J'ai essayé de le mettre en œuvre selon https://developer.android.com/training/connect-devices-wirelessly/nsd.html Maintenant, je ne sais pas si je l'ai fait tout droit, par exemple: La documentation android vous souhaite créer un RegistrationListener comme celui-ci:
Android:
public void initializeRegistrationListener() {
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();
}
@Override
public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
// Registration failed! Put debugging code here to determine why.
}
@Override
public void onServiceUnregistered(NsdServiceInfo arg0) {
// 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) {
// Unregistration failed. Put debugging code here to determine why.
}
};
}
Et je rebâti comme ça en C#:
public class RegistrationListener : NsdManager.IRegistrationListener
{
public string serviceName;
public void Dispose()
{
throw new NotImplementedException();
}
public IntPtr Handle { get; }
public void OnRegistrationFailed(NsdServiceInfo serviceInfo, NsdFailure errorCode)
{
// Registration failed! Put debugging code here to determine why.
}
public void OnServiceRegistered(NsdServiceInfo serviceInfo)
{
// 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.
serviceName = serviceInfo.ServiceName;
}
public void OnServiceUnregistered(NsdServiceInfo serviceInfo)
{
// Service has been unregistered. This only happens when you call
// NsdManager.unregisterService() and pass in this listener.
}
public void OnUnregistrationFailed(NsdServiceInfo serviceInfo, NsdFailure errorCode)
{
// Unregistration failed. Put debugging code here to determine why.
}
}
J'ai implémenté ResolveListener et DiscoveryListener de la même manière.
Alors je fait une classe d'assistance avec les fonctions que je veux appeler via DependencyServices:
public class NsdHelper
{
public static readonly string SERVICE_TYPE = "chatTest._tcp";
public DiscoveryListener discoveryListener;
public NsdManager nsdManager;
public NsdServiceInfo nsdServiceInfo;
public RegistrationListener registrationListener;
public ResolveListener resolveListener;
public string SERVICE_NAME { get; set; }
public void InitializeNsd()
{
resolveListener = new ResolveListener();
discoveryListener = new DiscoveryListener();
registrationListener = new RegistrationListener();
resolveListener.ServiceName = SERVICE_NAME;
resolveListener.ServiceInfo = nsdServiceInfo;
discoveryListener.resolveListener = resolveListener;
discoveryListener.nsdManager = nsdManager;
}
public void RegisterService(string sessionName)
{
SERVICE_NAME = sessionName;
// Create the NsdServiceInfo object, and populate it.
nsdServiceInfo = new NsdServiceInfo
{
ServiceName = sessionName,
ServiceType = SERVICE_TYPE,
Port = GenerateFreePort()
};
InitializeNsd();
// The name is subject to change based on conflicts
// with other services advertised on the same network.
nsdManager = (NsdManager) Application.Context.GetSystemService(Context.NsdService);
nsdManager.RegisterService(
nsdServiceInfo, NsdProtocol.DnsSd, registrationListener);
}
private int GenerateFreePort()
{
//setting the ServerSocket to 0 will generate the next free port
var serverSocket = new ServerSocket(0);
return serverSocket.LocalPort;
}
public void DiscoverServices()
{
nsdManager.DiscoverServices(
SERVICE_TYPE, NsdProtocol.DnsSd, discoveryListener);
}
public void StopDiscovery()
{
nsdManager.StopServiceDiscovery(discoveryListener);
}
public NsdServiceInfo GetChosenServiceInfo()
{
return nsdServiceInfo;
}
public void TearDown()
{
nsdManager.UnregisterService(registrationListener);
}
}
Et maintenant, quand je l'appelle RegisterService
je reçois l'erreur suivante:
Je ne sais pas où exactement je me suis trompé! Les erreurs je reçois pendant le débogage Xamarin Apps aussi ne pas aider beaucoup :(