android– 使用网络服务发现时注册失败,错误代码为0.

概述每当我使用registerService函数时,它都会出现代码错误为0的异常.1)我正在创建一个本地聊天服务应用程序,在那里我需要进行本地服务广播,而这样做我一直被困住,无论我做什么,注册总是失败,错误代码为0.我在onResume()或onPause()块中没有多个注册实例.2)Logcat只显示其他内容Att

每当我使用registerService函数时,它都会出现代码错误为0的异常.
1)我正在创建一个本地聊天服务应用程序,在那里我需要进行本地服务广播,而这样做我一直被困住,无论我做什么,注册总是失败,错误代码为0.
我在onResume()或onPause()块中没有多个注册实例.
2)Logcat只显示其他内容

Attempted to finish an input event but the input event receiver has already been disposed.

每当我点击右上角的注册服务按钮.

这是我的代码：

public String mServicename = "nearByDevices";NsdServiceInfo mService;/** * ATTENTION: This was auto-generated to implement the App Indexing API. * See https://g.co/AppIndexing/AndroIDStudio for more information. */private Googleapiclient clIEnt;   public voID registerService(int port) {    // Create the NsdServiceInfo object, and populate it.         // Cancel any prevIoUs registration request       initializeRegistrationListener();       NsdServiceInfo serviceInfo  = new NsdServiceInfo();       serviceInfo.setServicename(mServicename);       serviceInfo.setServiceType(SERVICE_TYPE);    serviceInfo.setPort(port);       NsdHelper(this);       mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);       mNsdManager.registerService(serviceInfo,NsdManager.PROTOCol_DNS_SD, mRegistrationListener);}public voID NsdHelper(Context context) {    mContext = context;    mNsdManager = (NsdManager) context.getSystemService(Context.NSD_SERVICE);}public voID initializeRegistrationListener() {    mRegistrationListener = new NsdManager.RegistrationListener() {        @OverrIDe        public voID onServiceRegistered(NsdServiceInfo NsdServiceInfo) {            mServicename = NsdServiceInfo.getServicename();            Toast.makeText(MainActivity.this, "Service registered:" + mServicename, Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onRegistrationFailed(NsdServiceInfo arg0, int arg1) {            Toast.makeText(MainActivity.this, "Service registration Failed:" + arg1, Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onServiceUnregistered(NsdServiceInfo arg0) {            Toast.makeText(MainActivity.this, "Service unregistered:" + arg0.getServicename(), Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {            Toast.makeText(MainActivity.this, "Service unregistration Failed:" + errorCode, Toast.LENGTH_LONG).show();        }    };}public voID initializediscoveryListener() {    // Instantiate a new discoveryListener    mdiscoveryListener = new NsdManager.discoveryListener() {        //  Called as soon as service discovery begins.        @OverrIDe        public voID ondiscoveryStarted(String regType) {            Toast.makeText(MainActivity.this, "Service discovery Started", Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onServiceFound(NsdServiceInfo service) {            // A service was found!  Do something with it.            Toast.makeText(MainActivity.this, "Service discovery Success:" + service.getServicename(), Toast.LENGTH_LONG).show();            if (!service.getServiceType().equals(SERVICE_TYPE)) {                // Service type is the string containing the protocol and                // transport layer for this service.                Toast.makeText(MainActivity.this, "UnkNown Service Type" + service.getServiceType(), Toast.LENGTH_LONG).show();            } else if (service.getServicename().equals(mServicename)) {                Toast.makeText(MainActivity.this, "Same Machine" + mServicename, Toast.LENGTH_LONG).show();            } else {                devices.add((service.getServicename()).toString());                }        }        @OverrIDe        public voID onServiceLost(NsdServiceInfo service) {            Toast.makeText(MainActivity.this, "Service Lost:" + service.getServicename(), Toast.LENGTH_LONG).show();            if (mService == service) {                mService = null;            }        }        @OverrIDe        public voID ondiscoveryStopped(String serviceType) {            Toast.makeText(MainActivity.this, "discovery Stopped" + serviceType, Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onStartdiscoveryFailed(String serviceType, int errorCode) {            Toast.makeText(MainActivity.this, "discovery Failed. Error Code" + errorCode, Toast.LENGTH_LONG).show();        }        @OverrIDe        public voID onStopdiscoveryFailed(String serviceType, int errorCode) {            Toast.makeText(MainActivity.this, "discovery Failed. Error Code" + errorCode, Toast.LENGTH_LONG).show();        }    };}        public voID initializeResolveListener() {            mResolveListener = 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;                    }                    mService = serviceInfo;                    int port = mService.getPort();                    InetAddress host = mService.getHost();                }    };}    public voID discoverServices() {    stopdiscovery();  // Cancel any existing discovery request    initializediscoveryListener();    mNsdManager.discoverServices(            SERVICE_TYPE, NsdManager.PROTOCol_DNS_SD, mdiscoveryListener);}public voID stopdiscovery() {    if (mdiscoveryListener != null) {        try {            mNsdManager.stopServicediscovery(mdiscoveryListener);        } finally {        }        mdiscoveryListener = null;    }} public NsdServiceInfo getChosenServiceInfo() {    return mService;}public voID tearDown() {    if (mRegistrationListener != null) {        try {            mNsdManager.unregisterService(mRegistrationListener);        } finally {        }        mRegistrationListener = null;    }}@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    Toolbar toolbar = (Toolbar) findVIEwByID(R.ID.toolbar);    setSupportActionbar(toolbar);    //initializeServerSocket();    devices = new ArrayList<String>();    ArrayAdapter adapter = new ArrayAdapter(this, R.layout.main_ListvIEw, devices);    ListVIEw ListVIEw = (ListVIEw) findVIEwByID(R.ID.device_List);    if(devices.isEmpty()) {    devices.add("No Devices Nearby");        ListVIEw.setAdapter(adapter);    }    else    ListVIEw.setAdapter(adapter);    // ATTENTION: This was auto-generated to implement the App Indexing API.    // See https://g.co/AppIndexing/AndroIDStudio for more information.    clIEnt = new Googleapiclient.Builder(this).addAPI(AppIndex.API).build();}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.menu_main, menu);    return true;}@OverrIDepublic boolean onoptionsItemSelected(MenuItem item) {    // Handle action bar item clicks here. The action bar will    // automatically handle clicks on the Home/Up button, so long    // as you specify a parent activity in AndroIDManifest.xml.    int ID = item.getItemID();    //noinspection SimplifiableIfStatement    switch (ID) {        case R.ID.register:           // initializeServerSocket();            registerService(65010);            return true;        case R.ID.discover:            discoverServices();            return true;        default:            return super.onoptionsItemSelected(item);    }}@OverrIDepublic voID onStart() {    super.onStart();    // ATTENTION: This was auto-generated to implement the App Indexing API.    // See https://g.co/AppIndexing/AndroIDStudio for more information.    clIEnt.connect();    Action vIEwAction = Action.newAction(            Action.TYPE_VIEW, // Todo: choose an action type.            "Main Page", // Todo: define a Title for the content shown.            // Todo: If you have web page content that matches this app activity's content,            // make sure this auto-generated web page URL is correct.            // Otherwise, set the URL to null.            Uri.parse("http://host/path"),            // Todo: Make sure this auto-generated app deep link URI is correct.            Uri.parse("androID-app://com.example.devesh1.mynewapp/http/host/path")    );    AppIndex.AppIndexAPI.start(clIEnt, vIEwAction);}@OverrIDepublic voID onStop() {    super.onStop();    // ATTENTION: This was auto-generated to implement the App Indexing API.    // See https://g.co/AppIndexing/AndroIDStudio for more information.    Action vIEwAction = Action.newAction(            Action.TYPE_VIEW, // Todo: choose an action type.            "Main Page", // Todo: define a Title for the content shown.            // Todo: If you have web page content that matches this app activity's content,            // make sure this auto-generated web page URL is correct.            // Otherwise, set the URL to null.            Uri.parse("http://host/path"),            // Todo: Make sure this auto-generated app deep link URI is correct.            Uri.parse("androID-app://com.example.devesh1.mynewapp/http/host/path")    );    AppIndex.AppIndexAPI.end(clIEnt, vIEwAction);    clIEnt.disconnect();}}

解决方法:

我在尝试使用NsdManager注册服务时遇到了这个问题.最后我发现服务类型必须遵循NsdManager documentation中作为示例描述的格式.为了澄清,格式为：“_ name._communicationprotocol”例如：“_ ipp._tcp”和“_http._tcp.
如果没有,则会导致回调onRegistrationFailed,errorCode = 0

BTW.来自NsdManager的调试日志不会从您的应用程序输出到Logcat.您必须使用“No Filters”查看日志才能查看NSD服务的调试信息

更新：再次偶然发现此错误.正在搜索_name._tcp.local但是我应该只搜索_name._tcp

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