SignalR Android 手机中的推送通知

Question

我使用 SignalR 开发了一个聊天应用程序。目前我正在将该代码移至 Android 应用程序的 WebAPI，

当用户向 Android 用户发送消息时，我想在 Android 手机上显示推送通知。是否可以在 Android 应用程序中使用 SignalR 作为客户端？

我看到了一些在线参考资料，例如 google GCm、ShaperChat，但我不理解它们。

Answer 1

是的，您可以在 Android 应用程序中使用 SignalR。但是，最好将您的应用配置为在前台时使用 SignalR，并在后台时切换到 Firebase 推送通知。这是因为当应用程序不活动时，SignalR 连接可能会断开。使用 Firebase 进行后台通知更可靠，因为它依赖于始终在设备上运行的 Google Play 服务。

一个简单的 signalR 实现 https://github.com/ngocchung/SimpleSignalRClient

Answer 2

是的，可以。 首先，确保您的 SignalR 服务工作正常，并记下您的令牌和集线器连接、组名称，您可以通过调用它们来订阅这些呼叫。

1）创建了一个单例类

public class SignalRSingleton {

private static SignalRSingleton mInstance = null;
public HubConnection mHubConnection;
public HubProxy mHubProxy;

public static SignalRSingleton getInstance(){
    if(mInstance == null)
    {
        mInstance = new SignalRSingleton();
    }
    return mInstance;
}

public void setmHubConnection()
{
    String serverUrl = "http://192.168.1.5:8089/XM/";
    //String serverUrl = "http://192.168.1.184/test";
    mHubConnection = new HubConnection(serverUrl);
}

public void setHubProxy()
{
   /* Credentials credentials = new Credentials() {
        @Override
        public void prepareRequest(Request request) {
            request.addHeader("User-Name", MainActivity.unm);
        }
    };*/

    //mHubConnection.setCredentials(credentials);
    String SERVER_HUB_CHAT = "messages";
    //String SERVER_HUB_CHAT = "Chat";
    mHubProxy = mHubConnection.createHubProxy(SERVER_HUB_CHAT);
}


/**
 * method for clients (activities)
 */
public void sendMessage(String name , String message) {

    String str = "{'RequestMessage':{'PID':'lr1','Password':'GIefhSIC5iBCnxioufbwEw == '},'RequestType':'Login'}";
    String SERVER_METHOD_SEND = "getMessage";
    //String SERVER_METHOD_SEND = "Send";
    mHubProxy.invoke(SERVER_METHOD_SEND,str);
  }
}

2）然后实施服务

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
    private SignalRSingleton mInstance;
    final static String MY_ACTION = "MY_ACTION";
    public SignalRService() {

    }
@Override
public void onCreate() {
    super.onCreate();
    mInstance = SignalRSingleton.getInstance();
    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() {
    mInstance.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)
 */


private void startSignalR() {
    Platform.loadPlatformComponent(new AndroidPlatformComponent());
    mInstance.setmHubConnection();
    mInstance.setHubProxy();
    ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.getLogger());
    SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.start(clientTransport);

    try {
        signalRFuture.get();
    } catch (InterruptedException | ExecutionException e) {
        Log.e("SimpleSignalR", e.toString());
        return;
    }

    mInstance.sendMessage(MainActivity.unm,"Hello All!");

    String CLIENT_METHOD_BROADAST_MESSAGE = "recievedMessage";
    //String CLIENT_METHOD_BROADAST_MESSAGE = "messageReceived";
    mInstance.mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE,
            new SubscriptionHandler2<String,LoginInfo>() {
                @Override
                public void run(final String msg,final LoginInfo loginInfo) {
                    final String finalMsg = loginInfo.FullName  + "  says " + loginInfo.Password;
                    Intent intent = new Intent();
                    intent.setAction(MY_ACTION);
                    intent.putExtra("DATAPASSED", finalMsg);
                    sendBroadcast(intent);
                }
            }
            , String.class,LoginInfo.class);
}
}

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