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Comment utiliser signalr dans Android

J'essaie d'intégrer signalR dans Android app mais pas de chance. J'ai consulté plusieurs liens, mais aucun d'entre eux ne fournit d'informations appropriées sur la mise en œuvre.

J'ai les questions suivantes.

  • SignalR l'intégration doit être effectuée dans Service/Intent Service?
  • Si nous voulons recevoir une réponse via la même méthode d'appel, comment l'obtenir?

J'ai ajouté trois bibliothèques: i.e signalr Android, signalr client et gson, mais je suis incapable de comprendre le fonctionnement du code. Aucune documentation appropriée n'est disponible pour comprendre le code.

Quelques questions posées mais peu d'informations

SignalR dans Android StudioImpossible d'implémenter le chat p2p avec SignalR dans Android

Si quelqu'un connaissait le signal d'applications natives, cela me serait très utile.

Mettre à jour

    public class SignalRService extends Service {


    private static final String TAG = "Service";
    private HubConnection mHubConnection;
    private HubProxy mHubProxy;
    private Handler mHandler; // to display Toast message
    private final IBinder mBinder = new LocalBinder(); 

    private SharedPreferences sp;

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

        Utility.showLog(TAG, "Service Created");

        sp = getSharedPreferences(Utility.SHARED_PREFS, MODE_PRIVATE);
        mHandler = new Handler(Looper.myLooper());
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        int result = super.onStartCommand(intent, flags, startId);
        startSignalR();
        return result;
    }

    @Override
    public IBinder onBind(Intent intent) {

        startSignalR();
        return mBinder;
    }

    /**
     * Class used for the client Binder.  Because we know this service always
     * runs in the same process as its clients, we don't need to deal with IPC.
     */
    public class LocalBinder extends Binder {
        public SignalRService getService() {
            // Return this instance of SignalRService so clients can call public methods
            return SignalRService.this;
        }
    }

    /**
     * method for clients (activities)
     */
    public void sendMessage() {

        String SERVER_METHOD_SEND = "iAmAvailable";
        final String string = new String();

        mHubProxy.invoke(new String(), SERVER_METHOD_SEND, sp.getString("user_id", null), sp.getString("pass", null), "TransMedic").done(new Action() {
            @Override
            public void run(Object o) throws Exception {

                Utility.showLog(TAG, o.toString());

            }


        }).onError(new ErrorCallback() {
            @Override
            public void onError(Throwable throwable) {

            }
        });
    }

    private void startSignalR() {

        Platform.loadPlatformComponent(new AndroidPlatformComponent());

        String serverUrl = "http://transit.alwaysaware.org/signalr";

        mHubConnection = new HubConnection(serverUrl);

        String SERVER_HUB_CHAT = "ChatHub";

        mHubProxy = mHubConnection.createHubProxy(SERVER_HUB_CHAT);

        ClientTransport clientTransport = new ServerSentEventsTransport(mHubConnection.getLogger());

        SignalRFuture<Void> signalRFuture = mHubConnection.start(clientTransport);


        try {

            signalRFuture.get();

        } catch (InterruptedException | ExecutionException e) {

            e.printStackTrace();
            return;

        }

        sendMessage();
    }

    @Override
    public void onDestroy() {

        mHubConnection.stop();
        super.onDestroy();

    }
}
c#android.netasp.net-mvcsignalr
30
moDev

MISE À JOUR 2018: 

Si vous utilisez SignalR.net Core, utilisez cette bibliothèque sinon vous obtiendrez une erreur de connexion.

DU CÔTÉ SERVEUR:

Ce qui suit est mon exemple de code côté serveur, vous pouvez porter une attention particulière à public void Send(string message) et public void SendChatMessage(string to, string message). 

  • Application côté serveur: public void SendChatMessage (chaîne de caractères à, message de chaîne)

    • Application client Android: mHubProxy.invoke ("SendChatMessage", receiverName, message);

  • Application côté serveur: public void Send (message de chaîne) 

    • Application client Android: mHubProxy.invoke ("Envoyer", message);
namespace SignalRDemo
{
    public class ChatHub : Hub
    {
        private static ConcurrentDictionary<string, string> FromUsers = new ConcurrentDictionary<string, string>();         // <connectionId, userName>
        private static ConcurrentDictionary<string, string> ToUsers = new ConcurrentDictionary<string, string>();           // <userName, connectionId>
        private string userName = "";

    public override Task OnConnected()
    {
        DoConnect();
        Clients.AllExcept(Context.ConnectionId).broadcastMessage(new ChatMessage() { UserName = userName, Message = "I'm Online" });
        return base.OnConnected();
    }

    public override Task OnDisconnected(bool stopCalled)
    {
        if (stopCalled) // Client explicitly closed the connection
        {
            string id = Context.ConnectionId;
            FromUsers.TryRemove(id, out userName);
            ToUsers.TryRemove(userName, out id);
            Clients.AllExcept(Context.ConnectionId).broadcastMessage(new ChatMessage() { UserName = userName, Message = "I'm Offline" });
        }
        else // Client timed out
        {
            // Do nothing here...
            // FromUsers.TryGetValue(Context.ConnectionId, out userName);            
            // Clients.AllExcept(Context.ConnectionId).broadcastMessage(new ChatMessage() { UserName = userName, Message = "I'm Offline By TimeOut"});                
        }

        return base.OnDisconnected(stopCalled);
    }

    public override Task OnReconnected()
    {
        DoConnect();
        Clients.AllExcept(Context.ConnectionId).broadcastMessage(new ChatMessage() { UserName = userName, Message = "I'm Online Again" });
        return base.OnReconnected();
    }

    private void DoConnect()
    {
        userName = Context.Request.Headers["User-Name"];
        if (userName == null || userName.Length == 0)
        {
            userName = Context.QueryString["User-Name"]; // for javascript clients
        }
        FromUsers.TryAdd(Context.ConnectionId, userName);
        String oldId; // for case: disconnected from Client
        ToUsers.TryRemove(userName, out oldId);
        ToUsers.TryAdd(userName, Context.ConnectionId);
    }

    public void Send(string message)
    {
        // Call the broadcastMessage method to update clients.            
        string fromUser;
        FromUsers.TryGetValue(Context.ConnectionId, out fromUser);
        Clients.AllExcept(Context.ConnectionId).broadcastMessage(new ChatMessage() { UserName = fromUser, Message = message });
    }

    public void SendChatMessage(string to, string message)
    {
        FromUsers.TryGetValue(Context.ConnectionId, out userName);
        string receiver_ConnectionId;
        ToUsers.TryGetValue(to, out receiver_ConnectionId);

        if (receiver_ConnectionId != null && receiver_ConnectionId.Length > 0)
        {
            Clients.Client(receiver_ConnectionId).broadcastMessage(new ChatMessage() { UserName = userName, Message = message });
        }
    }        
}

public class ChatMessage
{
    public string UserName { get; set; }
    public string Message { get; set; }
}
}

CÔTÉ CLIENT:

Si vous n'avez pas lu ma réponse à la question suivante: 

Intégration de SignalR dans un studio Android

Ensuite, voici mon code de base de travail:

public class SignalRService extends Service {
    private HubConnection mHubConnection;
    private HubProxy mHubProxy;
    private Handler mHandler; // to display Toast message
    private final IBinder mBinder = new LocalBinder(); // Binder given to clients

public SignalRService() {
}

@Override
public void onCreate() {
    super.onCreate();
    mHandler = new Handler(Looper.getMainLooper());
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    int result = super.onStartCommand(intent, flags, startId);
    startSignalR();
    return result;
}

@Override
public void onDestroy() {
    mHubConnection.stop();
    super.onDestroy();
}

@Override
public IBinder onBind(Intent intent) {
    // Return the communication channel to the service.
    startSignalR();
    return mBinder;
}

/**
 * Class used for the client Binder.  Because we know this service always
 * runs in the same process as its clients, we don't need to deal with IPC.
 */
public class LocalBinder extends Binder {
    public SignalRService getService() {
        // Return this instance of SignalRService so clients can call public methods
        return SignalRService.this;
    }
}

/**
 * method for clients (activities)
 */
public void sendMessage(String message) {
    String SERVER_METHOD_SEND = "Send";
    mHubProxy.invoke(SERVER_METHOD_SEND, message);
}    

private void startSignalR() {
    Platform.loadPlatformComponent(new AndroidPlatformComponent());

    Credentials credentials = new Credentials() {
        @Override
        public void prepareRequest(Request request) {
            request.addHeader("User-Name", "BNK");
        }
    };

    String serverUrl = "http://192.168.1.100";
    mHubConnection = new HubConnection(serverUrl);
    mHubConnection.setCredentials(credentials);
    String SERVER_HUB_CHAT = "ChatHub";
    mHubProxy = mHubConnection.createHubProxy(SERVER_HUB_CHAT);
    ClientTransport clientTransport = new ServerSentEventsTransport(mHubConnection.getLogger());
    SignalRFuture<Void> signalRFuture = mHubConnection.start(clientTransport);

    try {
        signalRFuture.get();
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
        return;
    }

    String HELLO_MSG = "Hello from Android!";
    sendMessage(HELLO_MSG);

    String CLIENT_METHOD_BROADAST_MESSAGE = "broadcastMessage";
    mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE,
            new SubscriptionHandler1<CustomMessage>() {
                @Override
                public void run(final CustomMessage msg) {
                    final String finalMsg = msg.UserName + " says " + msg.Message;
                    // display Toast message
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(), finalMsg, Toast.LENGTH_SHORT).show();
                        }
                    });
                }
            }
            , CustomMessage.class);
}
}

Activité:

public class MainActivity extends AppCompatActivity {

private final Context mContext = this;
private SignalRService mService;
private boolean mBound = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent intent = new Intent();
    intent.setClass(mContext, SignalRService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onStop() {
    // Unbind from the service
    if (mBound) {
        unbindService(mConnection);
        mBound = false;
    }
    super.onStop();
}    

public void sendMessage(View view) {
    if (mBound) {
        // Call a method from the SignalRService.
        // However, if this call were something that might hang, then this request should
        // occur in a separate thread to avoid slowing down the activity performance.
        EditText editText = (EditText) findViewById(R.id.edit_message);            
        if (editText != null && editText.getText().length() > 0) {                
            String message = editText.getText().toString();
            mService.sendMessage(message);
        }
    }
}

/**
 * Defines callbacks for service binding, passed to bindService()
 */
private final ServiceConnection mConnection = new ServiceConnection() {

    @Override
    public void onServiceConnected(ComponentName className,
                                   IBinder service) {
        // We've bound to SignalRService, cast the IBinder and get SignalRService instance
        SignalRService.LocalBinder binder = (SignalRService.LocalBinder) service;
        mService = binder.getService();
        mBound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        mBound = false;
    }
};
}

Classe CustomMessage:

public class CustomMessage {
    public String UserName;
    public String Message;
}

Vous pouvez également voir mon exemple de projet client sur ce lien GitHub

MISE À JOUR DE LA RÉPONSE DE INVOKE:

Je viens d'ajouter de nouvelles méthodes d'échantillonnage:

Du côté serveur:

public string iAmAvailable(string username, string password, string message)
{            
     return "BNK Response for testing Android INVOKE";
}

Côté client:

mHubProxy.invoke(String.class, "iAmAvailable", "username", "password", "TransMedic").done(new Action<String>() {
            @Override
            public void run(String s) throws Exception {
                Log.w("SimpleSignalR", s);
            }
        }).onError(new ErrorCallback() {
            @Override
            public void onError(Throwable throwable) {
                Log.e("SimpleSignalR", throwable.toString());
            }
        });

Et voici la capture d'écran:

 Android SignalR Invoke Response

30
BNK

Ce travail pour moi: Source complète Android (Client) et Serveur GitHub

Diapositive de serveur Si un argument doit utiliser cette interface SubscriptionHandler1 si deux arguments doivent utiliser cette interfaceSubscriptionHandler2, ...

Échantillon pour deux arguments comme:

Diapositive serveur:

using Microsoft.AspNet.SignalR;
namespace SignalRChat
{
    public class ChatHub : Hub
    {
        public void Send(string name, string message)
        {
            // Two argument must use this interfaceSubscriptionHandler2 .
            Clients.All.broadcastMessage(name, message);
        }

    }
}

Client slide:

mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE,
                new SubscriptionHandler2<String, String>() {
                    @Override
                    public void run(final String name,final String msg) {
                        final String finalMsg =  msg.toString();
                        // display Toast message
                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(getApplicationContext(), finalMsg, Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                }
                , String.class,String.class);

Pour attraper tout message peut utiliser ceci:

mHubConnection.received(new MessageReceivedHandler() {

            @Override
            public void onMessageReceived(final JsonElement json) {
                Log.e("onMessageReceived ", json.toString());
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(), json.toString(), Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
2
Ahmad Aghazadeh

Pour ceux qui implémentent signalR client dans Android et la réponse donnée ici ne permet pas de recevoir les messages, vous pouvez vérifier this répondre par rejnev.

La réponse implémente une méthode différente connection.received () qui est capable de recevoir des rappels de messages du serveur dans mon cas.

0
Umar Farooque

L'équipe de SignalR a récemment publié un client Java pour ASP.NET Core SignalR. Voici un lien pour démarrer la documentation https://docs.Microsoft.com/en-us/aspnet/core/signalr/Java-client?view=aspnetcore-2.2

0
Mikael Mengistu