Android(安卓)NSD注册服务，发现服务

import android.content.Context;import android.net.nsd.NsdManager;import android.net.nsd.NsdServiceInfo;import android.util.Log;public  class NSDHelper {    private static final String TAG = NSDHelper.class.getSimpleName();    private NsdManager.RegistrationListener mRegistrationListener;    private NsdManager.DiscoveryListener mDiscoveryListener;    private NsdManager mNsdManager;    private String mServiceName;    public NSDHelper(Context context) {        mNsdManager = (NsdManager) context.getApplicationContext().getSystemService(Context.NSD_SERVICE);    }    /**     * 注册NSD 服务，用来广播自己的服务     */    public void registerService(String serviceName, int port, NsdManager.RegistrationListener listener) {        mServiceName = (serviceName == null) ? Constants.NSD_SERVER_DEFAULT_NAME : serviceName;        NsdServiceInfo serviceInfo = new NsdServiceInfo();        serviceInfo.setPort(port);        serviceInfo.setServiceName(mServiceName);        serviceInfo.setServiceType(Constants.NSD_SERVER_TYPE);        initRegisterationListener(listener);        mNsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);    }    /**     * 取消注册服务     */    public void unRegisterService() {        mNsdManager.unregisterService(mRegistrationListener);    }    private void initRegisterationListener(NsdManager.RegistrationListener listener) {        if (listener == null) {            createDefaultListener();        } else {            mRegistrationListener = listener;        }    }    private void createDefaultListener() {        mRegistrationListener = new NsdManager.RegistrationListener() {            @Override            public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {                Log.i(TAG, "onRegistrationFailed,errCode = " + errorCode);            }            @Override            public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {                Log.i(TAG, "onUnregistrationFailed,errCode = " + errorCode);            }            @Override            public void onServiceRegistered(NsdServiceInfo serviceInfo) {                Log.i(TAG, "onServiceRegistered,serviceInfo=" + serviceInfo.toString());            }            @Override            public void onServiceUnregistered(NsdServiceInfo serviceInfo) {                Log.i(TAG, "onServiceUnregistered,serviceInfo=" + serviceInfo.toString());            }        };    }    /**     * 开始设备发现服务     */    public void startDiscoveryService(NsdManager.DiscoveryListener discoveryListener, NsdManager.ResolveListener resolveListener) {        initDiscoveryListener(discoveryListener);        mNsdManager.discoverServices(Constants.NSD_SERVER_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);    }    /**     * 停止设备发现服务     */    public void stopDiscoveryService() {        mNsdManager.stopServiceDiscovery(mDiscoveryListener);    }    private void initDiscoveryListener(NsdManager.DiscoveryListener discoveryListener) {        if (discoveryListener == null) {            createDefaultDiscoveryListener();        } else {            mDiscoveryListener = discoveryListener;        }    }    private void createDefaultDiscoveryListener() {        mDiscoveryListener = new NsdManager.DiscoveryListener() {            @Override            public void onStartDiscoveryFailed(String serviceType, int errorCode) {            }            @Override            public void onStopDiscoveryFailed(String serviceType, int errorCode) {            }            @Override            public void onDiscoveryStarted(String serviceType) {            }            @Override            public void onDiscoveryStopped(String serviceType) {            }            @Override            public void onServiceFound(NsdServiceInfo serviceInfo) {                Log.i(TAG, "onServiceFound,serviceInfo=  " + serviceInfo.toString());                if(serviceInfo.getServiceName().equalsIgnoreCase(mServiceName)){                    mNsdManager.resolveService(serviceInfo, new NsdManager.ResolveListener() {                        @Override                        public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {                        }                        @Override                        public void onServiceResolved(NsdServiceInfo serviceInfo) {                            Log.i(TAG, "onServiceResolved,serviceInfo=  " + serviceInfo.toString());                        }                    });                }            }            @Override            public void onServiceLost(NsdServiceInfo serviceInfo) {                Log.i(TAG, "onServiceLost,serviceInfo=  " + serviceInfo.toString());            }        };    }}

下面是打印的日志:

 onServiceRegistered,serviceInfo=name: dy.com.alphad.nsd, type: null, host: null, port: 0 I/NSDHelper: onServiceFound,serviceInfo=  name: dy.com.alphad.nsd, type: _http._tcp., host: null, port: 0 I/NSDHelper: onServiceResolved,serviceInfo=  name: dy.com.alphad.nsd, type: ._http._tcp, host: .....165, port: 1008

可以看出来，1.自己注册的服务也可以在被自己在发现服务的时候找到

2.serviceinfo 在解析之前只能读取到名称，解析之后才能看到全部信息。

另外(发现服务)和(向外广播自己的服务)据说比较耗电，记得开启INTENET权限。

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