Android SignalR java-client：没有收到 HubConnection 上的所有 SignalR 消息

Question

尝试了几个选项后，我无法在我的 Android 应用程序上接收所有 SignalR 消息。在我看来，这似乎与 LongPollingTransport 有关，但我找不到解决方案......我收到了所有 longPolling 消息，但有时它会进入处理程序，有时它会尝试再次连接到服务器而不输入处理程序方法。

我尝试按照here 上的示例进行操作。

代码很简单：

public void startNewSignalR(){

    Platform.loadPlatformComponent(new AndroidPlatformComponent());

    // Create a new console logger
    Logger logger = new Logger() {
        @Override
        public void log(String message, LogLevel level) {
            System.out.println(message);
        }
    };

    Uri signalRSource = Uri.parse(serverUrl);
    HubConnection connection = new HubConnection(signalRSource.toString(), "", true, logger);
    eventHub = connection.createHubProxy("eventHub");

    connection.error(new ErrorCallback() {

        @Override
        public void onError(Throwable error) {
            System.err.println("There was an error communicating with the server.");
            System.err.println("Error detail: " + error.toString());

            error.printStackTrace(System.err);
        }
    });

    // Subscribe to the connected event
    connection.connected(new Runnable() {

        @Override
        public void run() {
            System.out.println("CONNECTED");
        }
    });

    // Subscribe to the closed event
    connection.closed(new Runnable() {

        @Override
        public void run() {
            System.out.println("DISCONNECTED");
        }
    });

    eventHub.subscribe(new Object() {
        @SuppressWarnings("unused")
        public void receivePendingCountUpdate(String A) {
            System.out.println("------------------------>>>>> Count: " + A);
        }
    });

    // Start the connection
    connection.start(new LongPollingTransport(logger))
            .done(new Action<Void>() {

                @Override
                public void run(Void obj) throws Exception {
                    System.out.println("Done Connecting!");
                    eventHub.invoke("JoinGroup", "signalevents-" + userId + "-pendingcount");
                }
            });
}

在这里您还可以看到我收到的控制台输出，其中第一条消息没有进入方法，而第二条消息进入：

02-18 16:23:08.954    6877-9048/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting transport for Reconnection
02-18 16:23:10.307    6877-9031/com.sensingcontrol.android I/System.out﹕ longPolling - Trigger onData with data: {"C":"s-0,10BC5E0|1,264DB67|2,445369|3,106F98E|4,1EAF347","M":[{"H":"EventHub","M":"receivePendingCountUpdate","A":[208]}]}
02-18 16:23:10.307    6877-9031/com.sensingcontrol.android I/System.out﹕ HubConnection - Received data:
02-18 16:23:10.307    6877-9031/com.sensingcontrol.android I/System.out﹕ MessageId received: s-0,10BC5E0|1,264DB67|2,445369|3,106F98E|4,1EAF347
02-18 16:23:10.307    6877-9031/com.sensingcontrol.android I/System.out﹕ Invoking OnReceived with: null
02-18 16:23:10.307    6877-9031/com.sensingcontrol.android I/System.out﹕ HubConnection - Processing message
02-18 16:23:10.313    6877-9048/com.sensingcontrol.android I/System.out﹕ longPolling - Start the communication with the server
02-18 16:23:10.317    6877-9048/com.sensingcontrol.android I/System.out﹕ HubConnection - Getting connection data: [{"name":"eventhub"}]
02-18 16:23:10.317    6877-9048/com.sensingcontrol.android I/System.out﹕ longPolling - Execute the request
02-18 16:23:10.318    6877-9048/com.sensingcontrol.android I/System.out﹕ Create new thread for HTTP Connection
02-18 16:23:10.337    6877-9061/com.sensingcontrol.android I/System.out﹕ Execute the HTTP Request
02-18 16:23:10.337    6877-9061/com.sensingcontrol.android I/System.out﹕ URL: http://url/signalr/reconnect
02-18 16:23:10.342    6877-9061/com.sensingcontrol.android I/System.out﹕ VERB: GET
02-18 16:23:10.342    6877-9061/com.sensingcontrol.android I/System.out﹕ Header User-Agent: SignalR (lang=Java; os=android; version=2.0)
02-18 16:23:10.342    6877-9061/com.sensingcontrol.android I/System.out﹕ CONTENT: null
02-18 16:23:10.343    6877-9061/com.sensingcontrol.android I/System.out﹕ Request executed
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ HubConnection - Entered startLock after transport was started
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ HubConnection - Current state: Reconnecting
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting Heartbeat monitor
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ HubConnection - Reconnected
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ longPolling - Response received
02-18 16:23:10.498    6877-9061/com.sensingcontrol.android I/System.out﹕ longPolling - Read response to the end
02-18 16:23:10.918    6877-9032/com.sensingcontrol.android I/System.out﹕ longPolling - Trigger onData with data: {"C":"s-0,10BC5E1|1,264DB67|2,44536B|3,106F98F|4,1EAF347","M":[{"H":"EventHub","M":"receivePendingCountUpdate","A":[208]}]}
02-18 16:23:10.918    6877-9032/com.sensingcontrol.android I/System.out﹕ HubConnection - Received data:
02-18 16:23:10.938    6877-9030/com.sensingcontrol.android I/System.out﹕ MessageId received: s-0,10BC5E1|1,264DB67|2,44536B|3,106F98F|4,1EAF347
02-18 16:23:10.938    6877-9030/com.sensingcontrol.android I/System.out﹕ Invoking OnReceived with: null
02-18 16:23:10.938    6877-9030/com.sensingcontrol.android I/System.out﹕ HubConnection - Processing message
02-18 16:23:10.940    6877-9047/com.sensingcontrol.android I/System.out﹕ longPolling - Start the communication with the server
02-18 16:23:10.955    6877-9047/com.sensingcontrol.android I/System.out﹕ HubConnection - Getting connection data: [{"name":"eventhub"}]
02-18 16:23:10.955    6877-9047/com.sensingcontrol.android I/System.out﹕ longPolling - Execute the request
02-18 16:23:10.979    6877-9046/com.sensingcontrol.android I/System.out﹕ Create new thread for HTTP Connection
02-18 16:23:10.989    6877-9074/com.sensingcontrol.android I/System.out﹕ Execute the HTTP Request
02-18 16:23:10.989    6877-9074/com.sensingcontrol.android I/System.out﹕ URL: http://url/signalr/reconnect
02-18 16:23:10.989    6877-9074/com.sensingcontrol.android I/System.out﹕ VERB: GET
02-18 16:23:10.997    6877-9073/com.sensingcontrol.android I/System.out﹕ Header User-Agent: SignalR (lang=Java; os=android; version=2.0)
02-18 16:23:10.997    6877-9073/com.sensingcontrol.android I/System.out﹕ CONTENT: null
02-18 16:23:10.998    6877-9073/com.sensingcontrol.android I/System.out﹕ Request executed
02-18 16:23:11.217    6877-9074/com.sensingcontrol.android I/System.out﹕ HubConnection - Entered startLock after transport was started
02-18 16:23:11.217    6877-9074/com.sensingcontrol.android I/System.out﹕ HubConnection - Current state: Reconnecting
02-18 16:23:11.218    6877-9074/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting Heartbeat monitor
02-18 16:23:11.219    6877-9074/com.sensingcontrol.android I/System.out﹕ HubConnection - Reconnected
02-18 16:23:11.239    6877-9073/com.sensingcontrol.android I/System.out﹕ longPolling - Response received
02-18 16:23:11.239    6877-9073/com.sensingcontrol.android I/System.out﹕ longPolling - Read response to the end
02-18 16:23:12.721    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Timeout
02-18 16:23:12.721    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Stopping Heartbeat monitor
02-18 16:23:12.722    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Restarting the transport
02-18 16:23:12.722    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Entered startLock in startTransport
02-18 16:23:12.722    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting the transport
02-18 16:23:12.722    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Stopping heartbeat monitor
02-18 16:23:12.722    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Clearing invocation callbacks: Reconnecting
02-18 16:23:12.723    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting transport for Reconnection
02-18 16:23:14.073    6877-9061/com.sensingcontrol.android I/System.out﹕ longPolling - Trigger onData with data: {"C":"s-0,10BC5E7|1,264DB6C|2,445378|3,106F995|4,1EAF34C","M":[{"H":"EventHub","M":"receivePendingCountUpdate","A":[209]}]}
02-18 16:23:14.073    6877-9061/com.sensingcontrol.android I/System.out﹕ HubConnection - Received data:
02-18 16:23:14.074    6877-9061/com.sensingcontrol.android I/System.out﹕ MessageId received: s-0,10BC5E7|1,264DB6C|2,445378|3,106F995|4,1EAF34C
02-18 16:23:14.074    6877-9061/com.sensingcontrol.android I/System.out﹕ Invoking OnReceived with: null
02-18 16:23:14.123    6877-9073/com.sensingcontrol.android I/System.out﹕ HubConnection - Processing message
02-18 16:23:14.123    6877-9067/com.sensingcontrol.android I/System.out﹕ longPolling - Start the communication with the server
02-18 16:23:14.124    6877-9067/com.sensingcontrol.android I/System.out﹕ HubConnection - Getting connection data: [{"name":"eventhub"}]
02-18 16:23:14.124    6877-9067/com.sensingcontrol.android I/System.out﹕ longPolling - Execute the request
02-18 16:23:14.124    6877-9067/com.sensingcontrol.android I/System.out﹕ Create new thread for HTTP Connection
02-18 16:23:14.141    6877-9078/com.sensingcontrol.android I/System.out﹕ Execute the HTTP Request
02-18 16:23:14.141    6877-9078/com.sensingcontrol.android I/System.out﹕ URL: http://url/signalr/reconnect
02-18 16:23:14.141    6877-9078/com.sensingcontrol.android I/System.out﹕ VERB: GET
02-18 16:23:14.149    6877-9077/com.sensingcontrol.android I/System.out﹕ Header User-Agent: SignalR (lang=Java; os=android; version=2.0)
02-18 16:23:14.149    6877-9077/com.sensingcontrol.android I/System.out﹕ CONTENT: null
02-18 16:23:14.149    6877-9077/com.sensingcontrol.android I/System.out﹕ Request executed
02-18 16:23:14.267    6877-9079/com.sensingcontrol.android I/System.out﹕ HubConnection - Entered startLock after transport was started
02-18 16:23:14.267    6877-9079/com.sensingcontrol.android I/System.out﹕ HubConnection - Current state: Reconnecting
02-18 16:23:14.267    6877-9079/com.sensingcontrol.android I/System.out﹕ HubConnection - Starting Heartbeat monitor
02-18 16:23:14.268    6877-9079/com.sensingcontrol.android I/System.out﹕ HubConnection - Reconnected
02-18 16:23:14.271    6877-9077/com.sensingcontrol.android I/System.out﹕ longPolling - Response received
02-18 16:23:14.271    6877-9077/com.sensingcontrol.android I/System.out﹕ longPolling - Read response to the end
02-18 16:23:16.117    6877-9077/com.sensingcontrol.android I/System.out﹕ longPolling - Trigger onData with data: {"C":"s-0,10BC5F2|1,264DB6E|2,44537C|3,106F997|4,1EAF34E","M":[{"H":"EventHub","M":"receivePendingCountUpdate","A":[209]}]}
02-18 16:23:16.117    6877-9077/com.sensingcontrol.android I/System.out﹕ HubConnection - Received data:
02-18 16:23:16.118    6877-9077/com.sensingcontrol.android I/System.out﹕ MessageId received: s-0,10BC5F2|1,264DB6E|2,44537C|3,106F997|4,1EAF34E
02-18 16:23:16.136    6877-9077/com.sensingcontrol.android I/System.out﹕ Invoking OnReceived with: null
02-18 16:23:16.137    6877-9077/com.sensingcontrol.android I/System.out﹕ HubConnection - Processing message
02-18 16:23:16.137    6877-9077/com.sensingcontrol.android I/System.out﹕ HubConnection - Getting HubInvocation from message
02-18 16:23:16.138    6877-9077/com.sensingcontrol.android I/System.out﹕ HubConnection - Message for: eventhub
02-18 16:23:16.138    6877-9077/com.sensingcontrol.android I/System.out﹕ HubConnection - Invoking event: receivependingcountupdate with arguments [209]
02-18 16:23:16.138    6877-9077/com.sensingcontrol.android I/System.out﹕ HubProxy eventHub - Handling dynamic subscription: receivePendingCountUpdate
02-18 16:23:16.139    6877-9077/com.sensingcontrol.android I/System.out﹕ HubProxy eventHub - Invoking method for dynamic subscription: receivePendingCountUpdate
02-18 16:23:16.173    6877-9079/com.sensingcontrol.android I/System.out﹕ ------------------------>>>>> Count: 209
02-18 16:23:16.173    6877-9079/com.sensingcontrol.android I/System.out﹕ longPolling - Continue polling

Answer 1

我是 SignalR android 客户端方面的专家，我将向您展示最好的方法：

第 1 步： 像这样配置你的集线器连接

private HubConnection _connection;
private HubProxy _hub;

String host = "http://www.thisisawebsite.net"; //The url from your web site
            _connection = new HubConnection( host );
            _hub = _connection.createHubProxy( "NameHub" ); //The name from your hub class in your server

第 2 步：

使用私有方法或您想要的方式进行连接：

 private  SignalRFuture<Void> _awaitConnection;

     private void startConnection(){
             _awaitConnection = _connection.start(new LongPollingTransport(_connection.getLogger()));
//you can do here a while loop for reintents or something ( this is a good practices, at least 3 tries.
                try {         
                    _awaitConnection.get(2000,TimeUnit.MILLISECONDS);  
                    escucharGrupos();
                    isConnected = true;   
                    break;
                } catch (InterruptedException e) {
                         System.out.println("Disconnect . . .");
                } catch (ExecutionException e) {
                         System.out.println("Error . . .");
                }catch(Exception e){}
        } 

如果这里一切正确，您可以打印类似 System.out.println("Connection done");这意味着您的客户端和服务器之间的持久连接已经完成并且很好。

第 3 步：配置处理程序：

我通常用一个方法来做到这一点：

private SubscriptionHandler1 handlerCon;
private void starHandlersConnection(){
 handlerCon = new SubscriptionHandler1<String>() {
            @Override
            public void run(String p1) {
              //Here is where we get back the response from the server. Do stuffs
            }
        };

 _hub.on("NameOfFunctionOfYourHub",handlerCon,String.class);
}

按照所有这些步骤，这应该可以正常工作。

另外作为提示，将您的连接中心设置在服务类中。你可以用这种方式进行whatsapp或telegram之类的聊天。