连接错误：io.socket.engineio.client.EngineIOException：xhr 轮询错误
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【中文标题】连接错误：io.socket.engineio.client.EngineIOException：xhr 轮询错误【英文标题】：Error connecting: io.socket.engineio.client.EngineIOException: xhr poll error 【发布时间】：2018-10-30 10:31:35 【问题描述】：我正在尝试使用 socket.io 连接到 Nodejs 服务器和 android 客户端。尝试连接时出现 xhr poll 错误。我见过其他人提出的此类问题，但没有解决方案。我在节点服务器上有套接字 io 2.1.1 并在 Android 中使用 'io.socket:socket.io-client:0.8.3'。我的安卓版本是奥利奥。
这是我的 Android 客户端代码：
package com.example.socketiodemo;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import io.socket.client.IO;
import io.socket.client.Manager;
import io.socket.client.Socket;
import io.socket.emitter.Emitter;
public class MainActivity extends AppCompatActivity
private TextView display_text;
private Socket mSocket;
Manager mManager;
private boolean fClientClosedConnection;
private boolean fClientIsConnected;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
display_text = (TextView)findViewById(R.id.display_text);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
);
fClientClosedConnection = false;
fClientIsConnected = false;
new MyAsyncTask(mSocket).execute();
@Override
public 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;
@Override
public 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
if (id == R.id.action_settings)
return true;
return super.onOptionsItemSelected(item);
private class MyAsyncTask extends AsyncTask<String, Void, String>
Socket mSocket;
Manager mManager;
MyAsyncTask(Socket socket)
mSocket = socket;
@Override
protected String doInBackground(String... params)
Log.e(TAG, "Initiating the connection");
try
mSocket = IO.socket("http://192.168.0.104:4444");
mSocket.on(Socket.EVENT_CONNECT, onConnect);
mSocket.on(Socket.EVENT_DISCONNECT, onDisconnect);
mSocket.on(Socket.EVENT_CONNECT_ERROR, onConnectError);
mSocket.on(Socket.EVENT_CONNECT_TIMEOUT, onTimeoutError);
mSocket.on(Socket.EVENT_ERROR, onError);
mSocket.on("data", onNewMessage);
mSocket.connect();
while (!fClientClosedConnection)
// Keep the thread active
catch (URISyntaxException e)
e.printStackTrace();
Log.e(TAG, "Finished the background Process");
return "";
@Override
protected void onPostExecute(String result)
mSocket.close();
private Emitter.Listener onConnect = new Emitter.Listener()
@Override
public void call(Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
Log.e(TAG, "onConnect");
if(!fClientIsConnected)
Toast.makeText(getApplicationContext(),
"Client is connected", Toast.LENGTH_LONG).show();
fClientIsConnected = true;
);
;
private Emitter.Listener onDisconnect = new Emitter.Listener()
@Override
public void call(Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
Log.e(TAG, "diconnected");
fClientIsConnected = false;
Toast.makeText(getApplicationContext(),
"Client is disconnected", Toast.LENGTH_LONG).show();
);
;
private Emitter.Listener onConnectError = new Emitter.Listener()
@Override
public void call(final Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
Log.e(TAG, "Error connecting: " + args[0].toString());
Toast.makeText(getApplicationContext(),
"Client connect error", Toast.LENGTH_LONG).show();
);
;
private Emitter.Listener onTimeoutError = new Emitter.Listener()
@Override
public void call(Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
Log.e(TAG, "Timeout Error ");
);
;
private Emitter.Listener onError = new Emitter.Listener()
@Override
public void call(Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
Log.e(TAG, "Error ");
);
;
private Emitter.Listener onNewMessage = new Emitter.Listener()
@Override
public void call(final Object... args)
runOnUiThread(new Runnable()
@Override
public void run()
JSONObject data = (JSONObject) args[0];
String message;
try
message = data.getString("message");
catch (JSONException e)
Log.e(TAG, e.getMessage());
return;
printMessage(message);
if (message.contentEquals("Bye"))
fClientClosedConnection = true;
);
;
private void printMessage (String message)
display_text.setText(message);
这是我的 nodejs 服务器：
process.title = 'node-android';
var app = require('http').createServer()
var io = require('socket.io')(app);
app.listen(4444, onListenStart);
io.on('connection', onConnect);
function onListenStart()
console.log("Server listening on port: " + SERVER_PORT);
function onConnect(client)
console.log("client is connected");
client.emit("data", message: 'Hello');
client.on('event', onMessageReceived);
client.on('disconnect', onDisconnect);
function onMessageReceived(data)
console.log(data);
function onDisconnect()
console.log("client is disconnected");
我得到了这些日志：
05-20 21:48:56.404 28026-28026/com.example.socketiodemo E/MainActivity: Error connecting: io.socket.engineio.client.EngineIOException: xhr poll error
05-20 21:48:57.921 28026-28026/com.example.socketiodemo E/MainActivity: Error connecting: io.socket.engineio.client.EngineIOException: xhr poll error
请帮忙，因为我已经坚持了 3 天。
【问题讨论】：
你解决了吗？ 有人能解决这个问题吗？ 你有什么解决办法吗？我也面临同样的问题 @Abhishek 对此有什么解决方案吗？ @DeepakRana 我添加了通过我的服务器进行身份验证所需的 SSL 证书。 【参考方案1】：我在节点服务器上有套接字 io 2.1.1 并使用 'io.socket:socket.io-client:0.8.3'
我有类似的情况，将库版本更改为 1.0.0 有帮助。
【讨论】：
是的，使用 'io.socket:socket.io-client:1.0.0' 有助于连接稳定性和重新连接，但如果服务器在 HTTPS 上，则它再次无法连接到服务器，并且出现上述异常SSLHandShake 错误。【参考方案2】：您必须在清单中的应用程序标记中添加此代码，如下所示， 它解决了错误连接：io.socket.engineio.client.EngineIOException: xhr poll error 同样的问题
<Application . . android:usesCleartextTraffic="true"> . . . <Application/>
【讨论】：
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