我正在尝试将NsdServiceInfo的mHost作为参数传递给NsdManager.DiscoveryListener.onServiceFound(),但它为null.
我有两个 Android设备,其中设备1是服务器,设备2是客户端.
我有两个 Android设备,其中设备1是服务器,设备2是客户端.
这是我在设备1中注册服务器的方式
public void registerService(int port,InetAddress myIp) {
NsdServiceInfo serviceInfo = new NsdServiceInfo();
serviceInfo.setPort(port);
serviceInfo.setServiceName(this.serviceName);
serviceInfo.setServiceType(SERVICE_TYPE);
serviceInfo.setHost(myIp);
this.nsdManager.registerService(
serviceInfo,NsdManager.PROTOCOL_DNS_SD,registrationListener);
}
这就是我初始化DiscoveryListener的方法
public void initializeDiscoveryListener() {
discoveryListener = new NsdManager.DiscoveryListener() {
@Override
public void onServiceFound(NsdServiceInfo service) {
Log.d(TAG,"Service discovery success" + service);
if (!service.getServiceType().equals(SERVICE_TYPE)) {
Log.d(TAG,"Unknown Service Type: " + service.getServiceType());
} else if (service.getHost() == myIp) {
Log.d(TAG,"Same machine: " + service.getHost());
} else if (service.getServiceName().contains(serviceName)){
nsdManager.resolveService(service,resolveListener);
}
}
...
}
}
但是service.getHost()返回null.
有什么建议吗？
解决方法
我刚刚遇到了同样的问题,并在Google网页发现页面的帮助下设法解决了这个问题.
http://developer.android.com/training/connect-devices-wirelessly/nsd.html
问题是在发现服务时不知道连接信息.您必须先解决它,然后才能使用getHost().
你已经有了这条线：
nsdManager.resolveService(service,resolveListener);
resolveListener变量包含成功和失败的回调.您希望在成功确定连接信息后使用getHost().以下是Google的解决方案监听器：
public void initializeResolveListener() {
resolveListener = new NsdManager.ResolveListener() {
@Override
public void onResolveFailed(NsdServiceInfo serviceInfo,int errorCode) {
// Called when the resolve fails. Use the error code to debug.
Log.e(TAG,"Resolve Failed" + errorCode);
}
@Override
public void onServiceResolved(NsdServiceInfo serviceInfo) {
Log.e(TAG,"Resolve Succeeded. " + serviceInfo);
if (serviceInfo.getServiceName().equals(mServiceName)) {
Log.d(TAG,"Same IP.");
return;
}
service = serviceInfo;
int port = service.getPort();
InetAddress host = service.getHost(); // getHost() will work now
}
};
}
