我跟着本教程 https://whathecode.wordpress.com/2014/03/20/getting-started-with-the-java-signalr-sdk/为我的 Android 应用程序设置一个 .NET 后端来实现 Signal R。我设置了一个 SignalR 自托管后端。
这是我在控制台项目中的后端代码：
namespace SignalRSelfHost
{
class Program
{
static void Main(string[] args)
{
// This will *ONLY* bind to localhost, if you want to bind to all addresses
// use http://*:8080 to bind to all addresses.
// See http://msdn.microsoft.com/en-us/library/system.net.httplistener.aspx
// for more information.
string url = "http://localhost:8080";
using (WebApp.Start(url))
{
Console.WriteLine("Server running on {0}", url);
Console.ReadLine();
}
}
}
class Startup
{
public void Configuration(IAppBuilder app)
{
app.UseCors(CorsOptions.AllowAll);
app.MapSignalR();
}
}
public class MessageHub : Hub
{
public static event Action<string, string> MessageReceived = delegate { };
public void SendMessage(string name, string message)
{
MessageReceived(name, message);
}
}
public class CustomType
{
public string Name;
public int Id;
}
}
我的安卓代码：
Handler handler;
TextView statusField;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
handler = new Handler();
statusField = (TextView) findViewById(R.id.statusField);
Platform.loadPlatformComponent(new AndroidPlatformComponent());
// Change to the IP address and matching port of your SignalR server.
String host = "http://192.168.1.5:8080/";
HubConnection connection = new HubConnection( host );
HubProxy hub = connection.createHubProxy( "MessageHub" );
ClientTransport transport = new ServerSentEventsTransport(connection.getLogger());
SignalRFuture<Void> awaitConnection = connection.start(transport);
try {
awaitConnection.get();
}
catch (InterruptedException e) {
Log.d("CHECK", e.toString());
e.printStackTrace();
} catch (ExecutionException e) {
Log.d("CHECK", e.toString());
e.printStackTrace();
}
hub.subscribe(this);
try {
hub.invoke( "SendMessage", "Client", "Hello world!" ).get();
hub.invoke( "SendCustomType",
new CustomType() {{ Name = "Universe"; Id = 42; }} ).get();
} catch (InterruptedException e) {
// Handle ...
} catch (ExecutionException e) {
// Handle ...
}
}
public void UpdateStatus(String status) {
final String fStatus = status;
handler.post(new Runnable() {
@Override
public void run() {
statusField.setText(fStatus);
}
});
}
public class CustomType
{
public String Name;
public int Id;
}
然而，我最终遇到了一个挂起的屏幕，它不显示任何内容，并且应用程序停止响应。 android 记录器显示以下错误：
java.util.concurrent.ExecutionException：java.net.ConnectException：
15000 毫秒后无法连接到 localhost/127.0.0.1（端口 80）：
isConnected 失败：ECONNREFUSED（连接被拒绝）
我的代码正确吗？我是否正确遵循了指南？这是一个非常简单的指南，但这个问题出现了。有人可以帮忙吗？
EDIT:
This https://stackoverflow.com/questions/25621657/implementing-signal-r-in-android是一个非常相似的问题，实际上它描述了同一个问题。然而这对我没有任何好处。如果您注意到我的 Android 代码，我已经做了该问题中建议的更改。还是没有纠正问题。
堆栈跟踪
java.util.concurrent.ExecutionException: java.net.SocketTimeoutException: failed to connect to / 192.168.1.5(port 8080) after 15000ms
at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java: 112)
at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java: 102)
at com.example.dinuka.signalrtest.Main2Activity.onCreate(Main2Activity.java: 40)
at android.app.Activity.performCreate(Activity.java: 6289)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2655)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2767)
at android.app.ActivityThread.access$900(ActivityThread.java: 177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java: 1449)
at android.os.Handler.dispatchMessage(Handler.java: 102)
at android.os.Looper.loop(Looper.java: 145)
at android.app.ActivityThread.main(ActivityThread.java: 5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java: 372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 1195)
Caused by: java.net.SocketTimeoutException: failed to connect to / 192.168.1.5(port 8080) after 15000ms
at libcore.io.IoBridge.connectErrno(IoBridge.java: 169)
at libcore.io.IoBridge.connect(IoBridge.java: 122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java: 183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java: 456)
at java.net.Socket.connect(Socket.java: 882)
at com.android.okhttp.internal.Platform.connectSocket(Platform.java: 139)
at com.android.okhttp.Connection.connect(Connection.java: 1194)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java: 392)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java: 295)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java: 373)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java: 323)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java: 491)
at microsoft.aspnet.signalr.client.http.java.NetworkRunnable.run(NetworkRunnable.java: 72)
at java.lang.Thread.run(Thread.java: 818)
