Android应用程序使用Socket.io连接到Node.js服务器
我无法让我的Android应用程序连接到socket.io聊天服务器。我正在使用由Gottox创建的socket.io-java-
client，可以在这里找到：https :
//github.com/Gottox/socket.io-java-
client
服务器在端口7000上本地运行。我使用的是Android模拟器，因此我使用的是10.0.2.2:7000来访问服务器。
任何帮助将不胜感激，我对SSL没有任何经验。如果找到有效的解决方案，我也会将其发布。
var express = require('express');var app = express();
var server = require('http').createServer(app).listen(7000);
var io = require('socket.io').listen(server);
io.sockets.on('connection', function(client){
client.on('message', function(err, msg){
client.broadcast.emit('message', msg);
});
});
{ "name": "simplechat",
"version": "0.0.1",
"main": "app.js",
"dependencies": {
"express" : "~4.0.0",
"socket.io" : "~0.9.13"
}
}
public class SendMessageActivity extends Activity { private static final String SERVER_ADDRESS = "https://10.0.2.2:7000";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_send_message);
System.out.println("Sever: " + SERVER_ADDRESS);
try {
SocketIO socket = new SocketIO(new URL(SERVER_ADDRESS), new IOCallback() {
@Override
public void onDisconnect() {
System.out.println("disconnected");
}
@Override
public void onConnect() {
System.out.println("connected");
}
@Override
public void onMessage(String s, IOAcknowledge ioAcknowledge) {
}
@Override
public void onMessage(JSONObject jsonObject, IOAcknowledge ioAcknowledge) {
}
@Override
public void on(String event, IOAcknowledge ioAcknowledge, Object... objects) {
}
@Override
public void onError(SocketIOException e) {
e.printStackTrace();
}
});
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
}
<uses-permission android:name="android.permission.INTERNET">
</uses-permission>
08-09 16:07:28.224 8411-8441/com.example.puma.chatexample W/System.err﹕ io.socket.SocketIOException: Error while handshaking08-09 16:07:28.225 8411-8441/com.example.puma.chatexample W/System.err﹕ at io.socket.IOConnection.handshake(IOConnection.java:322)
08-09 16:07:28.225 8411-8441/com.example.puma.chatexample W/System.err﹕ at io.socket.IOConnection.access$600(IOConnection.java:39)
08-09 16:07:28.225 8411-8441/com.example.puma.chatexample W/System.err﹕ at io.socket.IOConnection$ConnectThread.run(IOConnection.java:199)
08-09 16:07:28.226 8411-8441/com.example.puma.chatexample W/System.err﹕ Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'javax.net.ssl.SSLSocketFactory javax.net.ssl.SSLContext.getSocketFactory()' on a null object reference
08-09 16:07:28.226 8411-8441/com.example.puma.chatexample W/System.err﹕ at io.socket.IOConnection.handshake(IOConnection.java:302)
08-09 16:07:28.227 8411-8441/com.example.puma.chatexample W/System.err﹕ ... 2 more
回答：
我实际上解决了问题。我使用了PC的本地IP
http://192.168.0.xxx:7000，该应用程序能够从模拟器连接到聊天服务器。我不知道为什么会这样，但是将来可能会对某人有所帮助:)
这就是我最终构造项目的方式。我创建了一个singleton类来处理Android端的套接字连接（您也可以将其作为服务来完成）。收到消息时，单例类向其他应用程序广播一个意图。然后由广播接收者在相关活动中获取意图。
public class SocketSingleton { private static SocketSingleton instance;
private static final String SERVER_ADDRESS = "http://1.2.3.4:1234";
private SocketIO socket;
private Context context;
public static SocketSingleton get(Context context){
if(instance == null){
instance = getSync(context);
}
instance.context = context;
return instance;
}
public static synchronized SocketSingleton getSync(Context context){
if (instance == null) {
instance = new SocketSingleton(context);
}
return instance;
}
public SocketIO getSocket(){
return this.socket;
}
private SocketSingleton(Context context){
this.context = context;
this.socket = getChatServerSocket();
this.friends = new ArrayList<Friend>();
}
private SocketIO getChatServerSocket(){
try {
SocketIO socket = new SocketIO(new URL(SERVER_ADDRESS), new IOCallback() {
@Override
public void onDisconnect() {
System.out.println("disconnected");
}
@Override
public void onConnect() {
System.out.println("connected");
}
@Override
public void on(String event, IOAcknowledge ioAcknowledge, Object... objects) {
if (event.equals("chatMessage")) {
JSONObject json = (JSONObject) objects[0];
ChatMessage chatMessage = new ChatMessage(json);
Intent intent = new Intent();
intent.setAction("newChatMessage");
intent.putExtra("chatMessage", chatMessage);
context.sendBroadcast(intent);
}
}
@Override
public void onError(SocketIOException e) {
e.printStackTrace();
}
});
return socket;
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
return null;
}
}
public class ChatActivity extends Activity { super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
IntentFilter newChatMessageFilter = new IntentFilter("newChatMessage");
this.registerReceiver(new MessageReceiver(), newChatMessageFilter);
...
public class MessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent){
final ChatMessage chatMessage =(ChatMessage) intent.getExtras().get("chatMessage");
runOnUiThread(new Runnable() {
@Override
public void run() {
mAdapter.add(chatMessage);
mAdapter.notifyDataSetChanged();
}
});
}
}
}
var express = require('express');var app = express();
var server = require('http').createServer(app).listen(1234);
var io = require('socket.io').listen(server);
io.sockets.on('connection', function(client){
console.log("client connected: " + client.id);
client.on("sendTo", function(chatMessage){
console.log("Message From: " + chatMessage.fromName);
console.log("Message To: " + chatMessage.toName);
io.sockets.socket(chatMessage.toClientID).emit("chatMessage", {"fromName" : chatMessage.fromName,
"toName" : chatMessage.toName,
"toClientID" : chatMessage.toClientID,
"msg" : chatMessage.msg});
});
});
以上是 Android应用程序使用Socket.io连接到Node.js服务器 的全部内容， 来源链接： utcz.com/qa/422240.html
