我通过使用库Gottox / socket.io-java-client使用socket io制作android应用程序我成功地将数据发送到服务器但是我在收到来自服务器的响应时遇到了这些错误
09-14 01:31:43.441: E/AndroidRuntime(585): FATAL EXCEPTION: main
09-14 01:31:43.441: E/AndroidRuntime(585): java.lang.NullPointerException
09-14 01:31:43.441: E/AndroidRuntime(585): at a.a.a.SocketsActivity$1.onClick(SocketsActivity.java:121)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.view.View.performClick(View.java:2408)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.view.View$PerformClick.run(View.java:8816)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.os.Handler.handleCallback(Handler.java:587)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.os.Handler.dispatchMessage(Handler.java:92)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.os.Looper.loop(Looper.java:123)
09-14 01:31:43.441: E/AndroidRuntime(585): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-14 01:31:43.441: E/AndroidRuntime(585): at java.lang.reflect.Method.invokeNative(Native Method)
09-14 01:31:43.441: E/AndroidRuntime(585): at java.lang.reflect.Method.invoke(Method.java:521)
09-14 01:31:43.441: E/AndroidRuntime(585): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-14 01:31:43.441: E/AndroidRuntime(585): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-14 01:31:43.441: E/AndroidRuntime(585): at dalvik.system.NativeStart.main(Native Method)
09-14 01:31:48.433: I/global(585): Default buffer size used in BufferedOutputStream constructor. It would be better to be explicit if an 8k buffer is required.
09-14 01:31:49.481: I/io.socket(585): > 3:::{"Action": "AuthenticateUser","Parameters":[{"UserName": "a","Password": "a"}]}
09-14 01:31:49.481: I/io.socket(585): < 1::
09-14 01:31:50.681: I/io.socket(585): < 5:::{"name":"message","args":[{"Action":"AuthenticateUser","RequestStatus":"100","RequestStatusMessage":"Invalid UserName/password"}]}
09-14 01:31:50.681: W/System.err(585): a.a.a.SocketIOException: Exception was thrown in on(String, JSONObject[]).
09-14 01:31:50.681: W/System.err(585): Message was: 5:::{"name":"message","args":[{"Action":"AuthenticateUser","RequestStatus":"100","RequestStatusMessage":"Invalid UserName/password"}]}
09-14 01:31:50.691: W/System.err(585): at a.a.a.IOConnection.transportMessage(IOConnection.java:684)
09-14 01:31:50.691: W/System.err(585): at a.a.a.WebsocketTransport.onMessage(WebsocketTransport.java:99)
09-14 01:31:50.691: W/System.err(585): at de.roderick.weberknecht.WebSocketReceiver.run(WebSocketReceiver.java:57)
09-14 01:31:50.691: W/System.err(585): Caused by: java.lang.ClassCastException: a.a.a.IOConnection
09-14 01:31:50.691: W/System.err(585): at a.a.a.IOConnection.findCallback(IOConnection.java:487)
09-14 01:31:50.701: W/System.err(585): at a.a.a.IOConnection.transportMessage(IOConnection.java:679)
09-14 01:31:50.701: W/System.err(585): ... 2 more
这是我的代码
private void SendDataToServer(String username,String password)
{
SocketIO socket=new SocketIO();
try {
socket = new SocketIO("http://41.69.103.53:1333/");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
socket.connect(new IOCallback() {
public void onMessage(JSONObject json, IOAcknowledge ack) {
try {
System.out.println("Server said:" + json.toString(2));
// x=json.toString(2);
// z=json.toString();
} catch (JSONException e) {
e.printStackTrace();
}
}
public void onMessage(String data, IOAcknowledge ack) {
//tv.setText(data);
//System.out.println("Server said: " + data);
// x=data;
}
public void onError(SocketIOException socketIOException) {
//tv.setText(socketIOException.toString());
//System.out.println("an Error occured");
request=0;
socketIOException.printStackTrace();
}
public void onDisconnect() {
// tv.setText("Connection terminated.");
//System.out.println("Connection terminated.");
request=0;
}
public void onConnect() {
// tv.setText("Connection terminated.");
// System.out.println("Connection established");
}
public void on(String event, IOAcknowledge ack, Object... args) {
//tv.setText("Server triggered event '" + event + "'");
// System.out.println("Server triggered event '" + event + "'");
x=event;
}
});
// This line is cached until the connection is establisched.
String request="{\"Action\": \"AuthenticateUser\""+","+
"\"Parameters\":";
String request_2="[{"+"\"UserName\": "+"\""+username_string+"\""+","+
"\"Password\""+": "+"\""+password_string+"\""+"}]}";
String FinalRequest_login=request+request_2;
socket.send(FinalRequest_login);
}
我发现导致异常的行
public void transportMessage(String text) {
logger.info("< " + text);
IOMessage message;
try {
message = new IOMessage(text);
} catch (Exception e) {
error(new SocketIOException("Garbage from server: " + text, e));
return;
}
resetTimeout();
switch (message.getType()) {
case IOMessage.TYPE_DISCONNECT:
try {
findCallback(message).onDisconnect();
} catch (Exception e) {
error(new SocketIOException(
"Exception was thrown in onDisconnect()", e));
}
break;
case IOMessage.TYPE_EVENT:
try {
JSONObject event = new JSONObject(message.getData());
Object[] argsArray;
if (event.has("args")) {
JSONArray args = event.getJSONArray("args");
argsArray = new Object[args.length()];
for (int i = 0; i < args.length(); i++) {
if (args.isNull(i) == false)
argsArray[i] = args.get(i);
}
} else
argsArray = new Object[0];
String eventName = event.getString("name");
try {
findCallback(message).on(eventName,
remoteAcknowledge(message), argsArray);
} **catch (Exception e) {
error(new SocketIOException(
"Exception was thrown in on(String, JSONObject[]).\n"
+ "Message was: " + message.toString(), e));**
}
这是例外 catch（例外e）{ 错误（新的SocketIOException（ “抛出了异常（String，JSONObject []）。\ n” +“消息是：”+ message.toString（），e））;
因为这个功能
public void on(String event, IOAcknowledge ack, Object... args) {
for (SocketIO socket : sockets.values())
socket.getCallback().on(event, ack, args);
}
任何人都可以解决它或帮助我为什么我会得到这个例外？提前谢谢
答案 0 :(得分：0)
然后在方法上尝试：
@Override
public void on(String event, IOAcknowledge ack, Object... args) {
Object[] a = args;
Log.d("app", a[0].toString());
}
});
首先将args对象解析为对象数组，然后调用0 index
处的值但它取决于服务器响应，您可以查看日志以获取详细的服务器响应