JSON指數2超出範圍的異常

Question

{ 
    "status": "true", 
    "value": { 
     "products": [ 
      { 
       "id": "1", 
       "store_categories_id": "10", 
       "description": "Chicken Briyani", 
       "unit_price": "120", 
       "pro_descripaation": "", 
       "pro_image": "" 
      }, 
      { 
       "id": "2", 
       "store_categories_id": "10", 
       "description": "Vegetable Thali", 
       "unit_price": "100", 
       "pro_descripaation": "", 
       "pro_image": "" 
      } 
     ] 
    } 
} 

錯誤：org.json.JSONException：指數2超出範圍[0..2）

try{ 
    JSONArray product_array = value_array.getJSONArray("products"); 
    for (int i = 0; i < response.length(); i++) { 
     if (status.equals("true")) { 
      // progressDialog.dismiss(); 

      Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show(); 
     } else if (status.equals("true")) { 

      // progressDialog.dismiss(); 
      JSONObject jsonobject = product_array.getJSONObject(i); 

      ProductList productList = new ProductList(); 

      productList.setDescription(jsonobject.getString(Constants.KEY_PRODUCT_DESCRIPTION)); 

      productList.setId(jsonobject.getString(Constants.KEY_PRODUCT_ID)); 
      Log.v("ganesh","keyboard"); 
      productListArray.add(productList); 
      adapter.notifyDataSetChanged(); 
     } 
    } 
} catch (JSONException exception) { 
    // progressDialog.dismiss(); 
    Log.e("--JSON EXCEPTION--", exception.toString()); 
} 

任何一個可以幫助我理清這個問題？

Answer 1

有在你的代碼幾件事情，似乎並不正確，而是因爲我沒有在整個範圍內，特別是兩個事有蹊蹺：

1. 您的循環是從0至response.length() ，這可能比您的product_array中的物品多。因此，您可能需要使用product_array.getJSONObject(i);或使用product_array.size()或product_array.length(),depending on your import。
2. 您的if..else if不正確。您檢查status.equals("true")兩次，這意味着代碼永遠不會到達第二個if。

Answer 2

私人無效callAPI_togetproducts（）{enter code here // progressDialog = ProgressDialog.show(StoreMenuActivity.this, "Please wait ...", "Requesting...", true);在此輸入代碼 // progressDialog.setCancelable（假）; enter code here OnRequestCompletedListener聽者=新OnRequestCompletedListener（）{enter code here @覆蓋enter code here 公共無效onRequestCompleted（字符串響應）{ Log.v（ 「 - 輸出存儲器MENU--」，response.toString（））; System.out.println（response.toString（））; //progressDialog.dismiss（）; 嘗試JSONObject obj = new JSONObject（response）; final String status = obj.getString（「status」）; final String value = obj.getString（「value」）; JSONObject value_array = obj.getJSONObject（「value」）;

   JSONArray product_array = value_array.getJSONArray("products"); 

       // final int product_array = response.length(); 
       //final int response = products.length(); 

       for (int i = 0; i < response.length(); i++) { 


        if (status.equals("false")) { 
         // progressDialog.dismiss(); 
         Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show(); 
        } else if (status.equals("true")) { 
         // progressDialog.dismiss(); 

         JSONObject jsonobject = product_array.getJSONObject(i); 
         ProductList productList = new ProductList(); 
         productList.setDescription(jsonobject.getString(Constants.KEY_PRODUCT_DESCRIPTION)); 
         productList.setId(jsonobject.getString(Constants.KEY_PRODUCT_ID)); 
         productListArray.add(productList); 
         adapter.notifyDataSetChanged(); 
        } 
       } 
      } catch (JSONException exception) { 
       // progressDialog.dismiss(); 
       Log.e("--JSON EXCEPTION--", exception.toString()); 
      } 
     } 
    }; 
    HashMap<String, String> user = session.getUserDetails(); 
    // token 
    String api_token = user.get(SessionManager.KEY_APITOKEN); 

    ServiceCalls.callAPI_togetproducts(this, Request.Method.POST,Constants.GET_PRODUCTS, listener, api_token,id); 
}