Android - setSoTimeout 不起作用 [英] Android - setSoTimeout not working

问题描述

所以我遇到了一个不工作的套接字超时.我按照现有帖子给出的所有说明进行操作，但仍然无法正常工作(我从未收到套接字超时异常).这是我的代码:

So I'm running into a not working socket timeout. I followed all instructions given by existing posts, but its still not working (I never get a socket timeout exception). Here is my code:

AsyncTask<String, Void, String> task = new AsyncTask<String, Void, String>() {
   @Override
   protected String doInBackground(String... params) {
      String location = params[0];

      try {
         HttpGet httpGet = new HttpGet(location);
         HttpParams httpParameters = new BasicHttpParams();

         // Set the timeout in milliseconds until a connection is established.
         // The default value is zero, that means the timeout is not used.
         int timeoutConnection = 0;
         HttpConnectionParams.setConnectionTimeout(httpParameters,
               timeoutConnection);

         // Set the default socket timeout (SO_TIMEOUT)
         // in milliseconds which is the timeout for waiting for data.
         int timeoutSocket = 2000;
         HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

         DefaultHttpClient client = new DefaultHttpClient(httpParameters);
         Log.d(this.getClass().getSimpleName(), "STARTING CLIENT!!! ");
         HttpResponse response = client.execute(httpGet);
         Log.d(this.getClass().getSimpleName(), "CLIENT CANCELLED!!! ");

         if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            response.getEntity().writeTo(out);
            return new Scanner(out.toString()).useDelimiter("\A").next();
         } else {
            return "";
         }
      } catch (IOException e) {
         e.printStackTrace();
         return null;
      } catch (URISyntaxException e) {
         e.printStackTrace();
         return null;
      }
   }

   @Override
   protected void onPostExecute(String result) {
      try {
         // doStuff
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
};
task.execute(location);

所以我应该在两秒后收到套接字超时异常，但客户端只是忽略了这一点.有什么帮助吗?

So I should get a socket timeout exception after two seconds, but the client is just ignoring that. Any help?

提前致谢

所有代码如下:

public void fetch(String location) {    
    AsyncTask<String, Void, String> task = new AsyncTask<String, Void, String>() {
        @Override
        protected String doInBackground(String... params) {
            String location = params[0];

            try {
                HttpGet httpGet = new HttpGet(location);
                HttpParams httpParameters = new BasicHttpParams();
                // Set the timeout in milliseconds until a connection is established.
                // The default value is zero, that means the timeout is not used. 
                int timeoutConnection = 0;
                HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
                // Set the default socket timeout (SO_TIMEOUT) 
                // in milliseconds which is the timeout for waiting for data.
                int timeoutSocket = 2000;
                HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

                DefaultHttpClient client = new DefaultHttpClient(httpParameters);
                Log.d(this.getClass().getSimpleName(), "STARTING CLIENT!!! ");
                HttpResponse response = client.execute(httpGet);
                Log.d(this.getClass().getSimpleName(), "CLIENT CANCELLED!!! ");

                if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
                    ByteArrayOutputStream out = new ByteArrayOutputStream();
                    response.getEntity().writeTo(out);
                    return new Scanner(out.toString()).useDelimiter("\A").next();
                } else {
                    return "";
                }
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            } catch (URISyntaxException e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(String result) {
            try {
                //doStuff
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    };
    task.execute(location);
}

推荐答案

不久前我遇到了类似的问题.我进行了一些试验并注意到，当我在模拟器中运行我的应用程序时，超时不起作用，而当我在真实设备上运行它时，它确实起作用了.我已经用 DefaultHttpClient、HttpUrlConnection 和 AndroidHttpClient 对其进行了测试，所有这三个都显示了相同的结果；无论任何设置的超时如何，在模拟器中大约 20 秒后都会出现 IOexception (UnknownHostException).

A while back I had similar problems. I've experimented a bit and noticed that when I ran my app in the emulator the timeouts didn't work and when I ran it on a real device it did work. I've tested it with the DefaultHttpClient, HttpUrlConnection and AndroidHttpClient, all three showed the same results; an IOexception (UnknownHostException) after about 20 seconds in the emulator regardless of any set timeout.

谷歌搜索发现其他人也报告了超时问题:

Googling revealed that other people have also reported problems with timeout:

• http://code.google.com/p/android/issues/detail?id=2409
• Android 上的 Http 连接超时无效
• http 连接超时问题
• 使用 DefaultHTTPClient 发出 HTTPGet 请求时的套接字超时

建议的解决方案都不适合我，所以我想唯一可靠的解决方案是自己管理超时.

None of the proposed solutions worked for me, so I guess the only reliable solution is to manage timeouts yourself.

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