应用程序在模拟器上运行良好，但在手机上运行时崩溃

Question

我正在编写一个应用程序，其中一个功能是从android设备更新外部sql数据库中的用户配置文件。所以我使用Background Async任务线程向update.php文件发送请求。应用程序在模拟器2.3.3上正常工作，它成功更新数据库中的配置文件，但当我尝试在平板电脑或手机上使用android 4.0.3运行它时，需要很长时间直到onPreExecute（）中定义的ProgressDialog消失，给我一个错误。这里是一个堆栈：

08-12 08:46:14.303: E/Buffer Error(3167): Error converting result java.io.IOException: Attempted read on closed stream. 
08-12 08:46:14.303: D/Update Response(3167): {"student":[{"understandPref":"0","genderPref":"Male","username":"ma","secondLangPref":"none","bilingualismPref":"no","ethnicPref":"American","lichPref":"0","pobPref":"Argentina","password":"fd","speakPref":"0","domLangPref":"US\/English","agePref":"15"}],"success":1} 
08-12 08:46:14.303: D/AndroidRuntime(3167): Shutting down VM 
08-12 08:46:14.303: W/dalvikvm(3167): threadid=1: thread exiting with uncaught exception (group=0x409e21f8) 
08-12 08:46:14.323: E/AndroidRuntime(3167): FATAL EXCEPTION: main 
08-12 08:46:14.323: E/AndroidRuntime(3167): java.lang.IllegalArgumentException: View not attached to window manager 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:587) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:324) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.view.WindowManagerImpl$CompatModeWrapper.removeView(WindowManagerImpl.java:151) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.app.Dialog.dismissDialog(Dialog.java:328) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.app.Dialog$1.run(Dialog.java:119) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.app.Dialog.dismiss(Dialog.java:313) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at edu.neiu.voiceofchicago.activities.SettingsActivity$UpdateAccount.onPostExecute(SettingsActivity.java:519) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at edu.neiu.voiceofchicago.activities.SettingsActivity$UpdateAccount.onPostExecute(SettingsActivity.java:1) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.os.AsyncTask.finish(AsyncTask.java:602) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.os.AsyncTask.access$600(AsyncTask.java:156) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.os.Looper.loop(Looper.java:137) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
08-12 08:46:14.323: E/AndroidRuntime(3167):  at dalvik.system.NativeStart.main(Native Method) 

它为什么在模拟器上工作，它不在手机上？请指教。谢谢。

JSONParser.class

public class JSONParser { 

static InputStream is = null; 
static JSONObject jObj = null; 
static String json = ""; 

// constructor 
public JSONParser() { 

} 

// function get json from url 
// by making HTTP POST or GET method 
public JSONObject makeHttpRequest(String url, String method, 
     List<NameValuePair> params) throws IOException { 

    // Making HTTP request 
    try { 

     // check for request method 
     if(method == "POST"){ 
      // request method is POST 
      // defaultHttpClient 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(params)); 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 


     }else if(method == "GET"){ 
      // request method is GET 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      String paramString = URLEncodedUtils.format(params, "utf-8"); 
      url += "?" + paramString; 
      HttpGet httpGet = new HttpGet(url); 

      HttpResponse httpResponse = httpClient.execute(httpGet); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 
     }   


    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    }catch (Exception ex) 
    { 
     Log.d("Networking", ex.getLocalizedMessage()); 
     throw new IOException("Error connecting"); 
    } 

    try { 
     BufferedReader reader = new BufferedReader(new InputStreamReader(
       is, "iso-8859-1"), 8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sb.append(line + "\n"); 
     } 
     is.close(); 
     json = sb.toString(); 
    } catch (Exception e) { 
     Log.e("Buffer Error", "Error converting result " + e.toString()); 
    } 

    // try parse the string to a JSON object 
    try { 
     jObj = new JSONObject(json); 
    } catch (JSONException e) { 
     Log.e("JSON Parser", "Error parsing data " + e.toString()); 
    } 

    // return JSON String 
    return jObj; 

    } 
} 

Answer 1

您的问题是

8月8日至12日：46：14.303：E /缓存器的错误（3167）：错误转换结果 java.io.IOException的：试图在封闭流中阅读。

把你的阅读从流部分放在try catch块中。最有可能的是你关闭了php文件的连接。