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我正在开发一个需要与 SQL 数据库连接的 Android 应用程序。该应用程序运行良好，我将服务器连接到 php 文件并使用 async 任务和 DefaultHttpClient 类（见下文）。

然后我用 ReadJSONFeedTask 读取收到的 JSON 文件并正确处理数据。一切正常，但是当我将两部带有该应用程序的智能手机连接到同一网络时，其中一个应用程序无法正常工作。

如果我关闭另一部智能手机中的 wifi 连接并通过网络连接 3G，这两个应用程序将再次运行。

我试过调试，我认为第二个应用程序会产生 IOException（见下文），但我不知道如何解决它。

我如何连接：

public class JSONActivity extends Activity {

public String readJSONFeed(String URL) {

    StringBuilder stringBuilder = new StringBuilder();

    HttpGet httpGet = new HttpGet(URL);
    HttpParams httpParameters = new BasicHttpParams();
    int timeoutConnection = 7000;
    HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
    int timeoutSocket = 10000;
    HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
    DefaultHttpClient client = new DefaultHttpClient(httpParameters);
    //HttpClient client = new DefaultHttpClient();

    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(content));             
            String line;
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
            }
        } else {
            Log.e("JSON", "Failed to download file: " + URL);
            Toast.makeText(getBaseContext(),"Codigo != 200" + URL, Toast.LENGTH_LONG).show();


        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        Toast.makeText(getBaseContext(),"ClientProtocolException " + e.getMessage().toString(), Toast.LENGTH_LONG).show();

    } catch (IOException e) {
        e.printStackTrace();
        Toast.makeText(getBaseContext(),"IOException " + e.getMessage().toString(), Toast.LENGTH_LONG).show();

    }
    return stringBuilder.toString();
}

//esta no se usa de momento 
public class ReadJSONFeedTask extends AsyncTask<String, Void, String> {

    JSONArray jsonArray;

    protected String doInBackground(String... urls) {
        return readJSONFeed(urls[0]);
    }

    protected void onPostExecute(String result) {
        try {

        } catch (Exception e){
            e.printStackTrace();
        }
    }
}

我确实像这样传递文件：

ReadJSONFeedTask task = new ReadJSONFeedTask();
    task.execute('http://www.xxxx.es/archivo.php');

调试器显示下一个错误：

    09-19 23:46:37.217: W/System.err(10202): org.apache.http.conn.ConnectTimeoutException: Connect to /213.177.193.111:80 timed out
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-19 23:46:37.217: W/System.err(10202):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-19 23:46:37.225: W/System.err(10202):    at com.gestion.LoginActivity.readJSONFeed(LoginActivity.java:3099)
09-19 23:46:37.225: W/System.err(10202):    at com.gestion.LoginActivity$CargarArchivo.doInBackground(LoginActivity.java:307)
09-19 23:46:37.225: W/System.err(10202):    at com.gestion.LoginActivity$CargarArchivo.doInBackground(LoginActivity.java:1)
09-19 23:46:37.225: W/System.err(10202):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-19 23:46:37.225: W/System.err(10202):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-19 23:46:37.225: W/System.err(10202):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-19 23:46:37.225: W/System.err(10202):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-19 23:46:37.225: W/System.err(10202):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-19 23:46:37.233: W/System.err(10202):    at java.lang.Thread.run(Thread.java:856)
09-19 23:46:37.233: E/JSON(10202): IOException: Connect to /213.177.193.111:80 timed out

谢谢你给我一个解决这个问题的线索。问候

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