Android，Android 4.0 中的 HttpPost 方法有问题吗？

Question

几年前，我开发了一个应用程序。在每个活动中，我都使用 HttpPost 方法将一些参数发送到服务器。在 Android v4.0 以下的所有设备上使用 3G 服务运行良好。我的代码是这样的：

private String postData() {
    HttpClient httpClient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(PropertyManager.getLoginURL());

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);
    nameValuePairs.add(new BasicNameValuePair("u", Uri.encode(PropertyManager.getUserId())));
    nameValuePairs.add(new BasicNameValuePair("p", Encryption.encrypt(PropertyManager.getPassword())));
    nameValuePairs.add(new BasicNameValuePair("v", PropertyManager.VER));
    nameValuePairs.add(new BasicNameValuePair("t", "0"));

    try {
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        Log.i("Requestd Connection", httppost.getURI().toString());


        HttpResponse response = httpClient.execute(httppost);
        String responseBody = EntityUtils.toString(response.getEntity());
        Log.i("Server Response: ", responseBody);

        if (response.containsHeader("Set-Cookie")) {
            String sessionId = extractSessionId(response.getHeaders("Set-Cookie")[0].getValue());
            PropertyManager.setSessionID(sessionId);
            Log.i("Session Id:", sessionId);
        }


    String str = responseBody.substring(0, 9);
    if(str.equalsIgnoreCase("<!DOCTYPE")) {
        Log.i("postData()", "HTML found instead of XML. Try to extract info...");

        str = responseBody.substring(responseBody.indexOf("<tr>")+4, responseBody.lastIndexOf("</tr>"));
        str = str.toUpperCase();
        Log.i("Extracted info", str);

        return str;
    } else              
        return responseBody;

    } catch(UnsupportedEncodingException usee) {
        usee.printStackTrace();
    } catch(ClientProtocolException cpe) {
        cpe.printStackTrace();
    } catch(IOException ioe) {
        ioe.printStackTrace();
    }

    return null;
}

logcat 中的预期结果（我可以在 v4.0 以下的 Android 操作系统上得到它）：

07-09 12:38:49.593: I/JupiterMPro(4273):                onCreate executes ...
07-09 12:38:49.601: I/MSBootUp(4273):                   inside onCreate();
07-09 12:38:49.694: I/MA_isOnline(4273):                Checking Internet Connection...
07-09 12:38:49.698: I/MA_isOnline(4273):                Internet Connection found.
07-09 12:38:49.730: I/JupiterMPro(4273):                onDestroy executes ...
07-09 12:39:40.675: I/MA_isOnline(4273):                Checking Internet Connection...
07-09 12:39:40.679: I/MA_isOnline(4273):                Internet Connection found.
07-09 12:39:40.820: I/Requestd Connection(4273):        http://demo.excelforce.com.my/mobiletraderjssb/dopwd.aspx?
07-09 12:39:44.609: I/Server Response:(4273):           <TD ID="LGFLAG">S</TD><TD ID="LGMSG"></TD><TD ID="CLNT_0">CLNTXXX,EF TEST,C,001,</TD>
07-09 12:39:44.613: I/Session Id:(4273):                ASPNETSESSIONID=zkuus2n304jnkubi4e1nqnuw
07-09 12:39:44.714: I/JupiterMPro(4273):                onCreate executes ...
07-09 12:39:45.140: I/MSMarket(4273):                   Creating activity...
07-09 12:39:45.202: I/JupiterMPro(4273):                onStart executes ...
07-09 12:39:45.202: I/JupiterMPro(4273):                onResume executes ...
07-09 12:39:45.241: I/MSMarket, Requested URL:(4273):   http://demo.excelforce.com.my/mobiletraderjssb/mtjvg.aspx?marketsummary&msg=1&brd=0
07-09 12:39:45.601: I/MSLogin(4273):                    onStop executes ...
07-09 12:39:46.702: I/MSMarket, Response code:(4273):   200
07-09 12:39:46.718: I/MSMarket, Server Response:(4273): 50,9/7/2012*12:39 PM#1619.61&-0.94&0&448.392m&399.033m&264&331&293&682&1&V
07-09 12:39:46.855: I/Timer(4273):                      Timer executes...
07-09 12:39:46.855: I/Timer(4273):                      seconds elapsed: 1
07-09 12:39:47.757: I/Timer(4273):                      Timer executes...
07-09 12:39:47.761: I/Timer(4273):                      seconds elapsed: 2
07-09 12:39:48.757: I/Timer(4273):                      Timer executes...
07-09 12:39:48.761: I/Timer(4273):                      seconds elapsed: 3

但是，当我通过 3G 服务和 Android 版本 4.0.3 和 4.0.4 连接到互联网时，我在 logcat 中的输出是这样的：

07-09 14:19:15.395: I/JupiterMPro(4750): onCreate executes ...
07-09 14:19:15.410: I/MSBootUp(4750): inside onCreate();
07-09 14:19:15.465: I/MA_isOnline(4750): Checking Internet Connection...
07-09 14:19:15.465: I/MA_isOnline(4750): Internet Connection found.
07-09 14:19:15.560: I/JupiterMPro(4750): onDestroy executes ...
07-09 14:19:43.765: I/MA_isOnline(4750): Checking Internet Connection...
07-09 14:19:43.765: I/MA_isOnline(4750): Internet Connection found.
07-09 14:19:44.015: I/Requestd Connection(4750): http://demo.excelforce.com.my/mobiletraderjssb/dopwd.aspx?
07-09 14:20:09.350: I/Server Response:(4750): <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
07-09 14:20:09.350: I/Server Response:(4750):     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
07-09 14:20:09.350: I/Server Response:(4750): <html xmlns="http://www.w3.org/1999/xhtml">
07-09 14:20:09.350: I/Server Response:(4750): <head>
07-09 14:20:09.350: I/Server Response:(4750): <title></title>
07-09 14:20:09.350: I/Server Response:(4750): </head>
07-09 14:20:09.350: I/Server Response:(4750): <body>
07-09 14:20:09.350: I/Server Response:(4750): <table>
07-09 14:20:09.350: I/Server Response:(4750): <tr>
07-09 14:20:09.350: I/Server Response:(4750): <td id="LGFLAG">S</td>
07-09 14:20:09.350: I/Server Response:(4750): <td id="LGMSG"></td>
07-09 14:20:09.350: I/Server Response:(4750): <td id="CLNT_0">CLNTXXX,EF TEST,C,001,</td>
07-09 14:20:09.350: I/Server Response:(4750): </tr>
07-09 14:20:09.350: I/Server Response:(4750): </table>
07-09 14:20:09.350: I/Server Response:(4750): </body>
07-09 14:20:09.350: I/Server Response:(4750): </html>
07-09 14:20:09.350: I/postData()(4750): HTML found instead of XML. Try to extract info...
07-09 14:20:09.365: I/Extracted info(4750): <TD ID="LGFLAG">S</TD>
07-09 14:20:09.365: I/Extracted info(4750): <TD ID="LGMSG"></TD>
07-09 14:20:09.365: I/Extracted info(4750): <TD ID="CLNT_0">CLNTXXX,EF TEST,C,001,</TD>
07-09 14:20:09.460: I/JupiterMPro(4750): onCreate executes ...
07-09 14:20:09.510: I/webclipboard(4750): clipservice: android.sec.clipboard.ClipboardExManager@41994c30
07-09 14:20:09.615: I/MSMarket(4750): Creating activity...
07-09 14:20:09.685: I/JupiterMPro(4750): onStart executes ...
07-09 14:20:09.685: I/JupiterMPro(4750): onResume executes ...
07-09 14:20:09.755: I/MSMarket, Requested URL:(4750): http://demo.excelforce.com.my/mobiletraderjssb/mtjvg.aspx?marketsummary&msg=1&brd=0
07-09 14:20:10.030: I/MSLogin(4750): onStop executes ...
07-09 14:20:11.350: I/MSMarket, Response code:(4750): 200
07-09 14:20:11.365: I/MSMarket, Server Response:(4750): 50,9/7/2012*2:20 PM#1619.61&-0.94&0&448.392m&399.033m&264&331&293&682&1&P

其实，我不知道这段 HTML 代码是从哪里来的！因为为了连接3G，移动运营商会自动为手机设置代理。我们怀疑代理设置。有人在Java, does proxy setting affect received data? 中提到，也许代理服务器会注入此代码并包装我想要的数据。我认为这个想法是不正确的，因为在相同的情况下，当我为两个 Android V2.0 使用一张 sim 卡 (3G) 时。 V3.0 和 v4.0 虽然代理设置对所有这些都相同，但我在 v4.0 中收到错误的数据。我猜想 Android v4.0 的 HttpPost 库有问题！

这里发生了什么？此代码适用于 v4.0 以下的 Android，但不适用于 Android v4.0 及更高版本！

你有过这样的经历吗？你做了什么？ 任何建议，将不胜感激。谢谢

Answer 1

您是否考虑过该问题是否与running a network operation on the main thread 有关？ 您不能在蜂窝 (3.0) 和转发的主线程上执行网络操作。

Answer 2

你必须使用 AsycTask

http://developer.android.com/reference/android/os/AsyncTask.html

或一个新的线程来管理 http 连接。 您不能使用主踏板拨打电话。

AsyctTask 和 Thread 基本相同，但 AsycTask 实现了 4 个基本方法。

onPreExecute()、onPostExecute、onProgressUpdate 和 doInBackground。

试一试，告诉我们它是否有效。