비동기 작업 null 오류

Question

현재 JSON 문자열을 구문 분석하는 비동기 작업을하고 있습니다. 문자열 구문 분석 및 doInBackground()에서 작업은 나에게이 오류주고) postExecute (로 이동되면 : 그것은 완벽하게 이전에 작업 한

06-17 20:19:53.612: E/AndroidRuntime(591): FATAL EXCEPTION: main 
06-17 20:19:53.612: E/AndroidRuntime(591): java.lang.NumberFormatException: unable to parse 'null' as integer 
06-17 20:19:53.612: E/AndroidRuntime(591): at java.lang.Integer.parseInt(Integer.java:356) 
06-17 20:19:53.612: E/AndroidRuntime(591): at java.lang.Integer.parseInt(Integer.java:332) 
06-17 20:19:53.612: E/AndroidRuntime(591): at stefan.testservice.ParkingActivity$DownloadTask.onPostExecute(ParkingActivity.java:258) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.os.AsyncTask.finish(AsyncTask.java:417) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.os.AsyncTask.access$300(AsyncTask.java:127) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.os.Looper.loop(Looper.java:123) 
06-17 20:19:53.612: E/AndroidRuntime(591): at android.app.ActivityThread.main(ActivityThread.java:3683) 
06-17 20:19:53.612: E/AndroidRuntime(591): at java.lang.reflect.Method.invokeNative(Native Method) 
06-17 20:19:53.612: E/AndroidRuntime(591): at java.lang.reflect.Method.invoke(Method.java:507) 
06-17 20:19:53.612: E/AndroidRuntime(591): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
06-17 20:19:53.612: E/AndroidRuntime(591): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
06-17 20:19:53.612: E/AndroidRuntime(591): at dalvik.system.NativeStart.main(Native Method) 

, 단지 그것의 갑자기이 일부에 문제가있는 것을 비동기 작업의 끝에서 'return null'문. 솔루션을 찾을 수없는 것 같습니다. 미리 감사드립니다.

내 코드 :

private class DownloadTask extends AsyncTask<String, Void, Object> { 
    @Override 
    protected Object doInBackground(String... args) { 
     Log.i("MyApp", "Background thread starting"); 

      Global.url = "http://10.0.2.2:8000/CarServiceScheduling1/resources/json/product/getpark?degree="+degreeStatus+"&year="+yearStatus+"&distance="+distance+"&devid="+Global.android_id; 

      try{ 
       statusCode = cg.connection();  
      }catch (Exception e) { 
       test_connection = true; 
      } 


      if(test_connection == false){ 

       try { 
        output = cg.stringconverter(Global.data); 
        cg.parseGson(output); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 

      } 
     } 
     return null; 
    } 



protected void onPostExecute(Object result) { 

       if (ParkingActivity.this.progressDialog != null) { 
        ParkingActivity.this.progressDialog.dismiss(); 

        if(CheckboxPreference == true && Integer.parseInt(Global.preference1) == 0 && Integer.parseInt(Global.preference2) == 0 && (Global.status.equalsIgnoreCase("No Slots available") || Global.status.equalsIgnoreCase("No"))){ 


         Intent searchSubActivity = new Intent(getBaseContext(), 
           Nospotsactivity.class); 
         startActivity(searchSubActivity); 
        } 
        else if (CheckboxPreference == true && (Integer.parseInt(Global.preference1) != 0 || Integer.parseInt(Global.preference2) != 0)){ 

         Intent searchSubActivity = new Intent(getBaseContext(), 
           Spotsfoundactivity.class); 
         startActivity(searchSubActivity); 
        } 
        else if(CheckboxPreference == false && (Integer.parseInt(Global.preference1) != 0 || Integer.parseInt(Global.preference2) != 0)){ 


         Intent searchSubActivity = new Intent(getBaseContext(), 
           Spotsfoundactivity.class); 
         startActivity(searchSubActivity); 
        } 
        if(Integer.parseInt(Global.preference1) == 0 && Integer.parseInt(Global.preference2) == 0){ 

         if(Global.status.equalsIgnoreCase("Hardly Likely")){ 


          Intent searchSubActivity = new Intent(getBaseContext(), 
            Unlikelyactivity.class); 
          startActivity(searchSubActivity); 
         } 


         else if(Global.status.equalsIgnoreCase("Likely")){ 


          Intent searchSubActivity = new Intent(getBaseContext(), 
            Likelyactivity.class); 
          startActivity(searchSubActivity); 

         } 
        } 
       } 
      } 
     } 
    } 
} 

Answer 1

하여 스택 트레이스에 따르면

, 어느 Global.preference1 또는 Global.preference2 null 인 (또는 둘 다). 정수로 파싱하기 전에 널 체크를 원할 수 있습니다.