Android NSD无法发现所有服务 [英] Android NSD not discovering all services

问题描述

我试图使用Android本机服务发现来运行应用程序，但是有时当我运行该应用程序时，它无法发现我网络中的所有服务.我正在使用四个星系关系从 https://github.com/joeluchoa/nsd 中运行代码，大多数情况下是每次他们中的同一时间发现了不同数量的服务.

I'm trying to run an application using Android Native Service Discovery but sometimes when I run the application, it doesn't discover all services from my network. I'm running the code from https://github.com/joeluchoa/nsd using four galaxy nexus and most of the times each of them discoveries different number of services at the same time.

基本上，我使用ServerSocket运行服务:

Basically I run a service with a ServerSocket:

ServerSocket server = new ServerSocket(0);
Log.i(TAG, "IP " + server.getInetAddress()
        + ", running on port " + server.getLocalPort());

Intent intent = new Intent(MySocket.this,
        MyPresence.class);
intent.putExtra("PORT", server.getLocalPort());
startService(intent);

然后我使用NsdManager中的registerService方法发布它:

Then I publish it using the method registerService from NsdManager:

NsdServiceInfo serviceInfo = new NsdServiceInfo();

serviceInfo.setServiceName(Build.SERIAL + "-" + new Date().getTime());
serviceInfo.setServiceType(SERVICE_TYPE);
serviceInfo.setPort(port);

mNsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD,
        mRegistrationListener);

要发现服务，我使用NsdManager中的discoverServices方法:

To discover the services I use the method discoverServices from NsdManager:

mNsdManager.discoverServices(SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD,
        mDiscoveryListener);

使用mDiscoveryListener如下:

With mDiscoveryListener as follows:

mDiscoveryListener = new NsdManager.DiscoveryListener() {

    @Override
    public void onDiscoveryStarted(String regType) {
        Log.d(TAG, "Service discovery started");
    }

    @Override
    public void onServiceFound(NsdServiceInfo service) {
        Log.d(TAG, "Service discovery success");
        Log.d(TAG, String.format("%s %s %s %d",
                service.getServiceName(), service.getServiceType(),
                service.getHost(), service.getPort()));
        if (!service.getServiceType().contains(SERVICE_TYPE)) {
            Log.d(TAG,
                    "Unknown Service Type: " + service.getServiceType());
        } else if (service.getServiceName().equals(mServiceName)) {
            Log.d(TAG, "Same machine: " + mServiceName);
        } else {
            mNsdManager.resolveService(service, mResolveListener);
        }
    }

    @Override
    public void onServiceLost(NsdServiceInfo service) {
        Log.e(TAG, "service lost" + service);
    }

    @Override
    public void onDiscoveryStopped(String serviceType) {
        Log.i(TAG, serviceType + " Discovery stopped: " + serviceType);
    }

    @Override
    public void onStartDiscoveryFailed(String serviceType, int errorCode) {
        Log.e(TAG, serviceType + " Discovery failed: Error code:"
                + errorCode);
        mNsdManager.stopServiceDiscovery(this);
    }

    @Override
    public void onStopDiscoveryFailed(String serviceType, int errorCode) {
        Log.e(TAG, serviceType + " Discovery failed: Error code:"
                + errorCode);
        mNsdManager.stopServiceDiscovery(this);
    }
};

我做错什么了吗?有人知道解决方案或解决方法吗?

Am i doing something wrong? Does anybody know a solution or a workaround for this?

推荐答案

要发现已连接网络的所有服务，只需更改要发现的服务类型，

To discover all services of the connected network just change the service type you are discovering,

public static final String SERVICE_TYPE = "_services._dns-sd._udp";

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