如何从子阵列从主阵列获取JSON值

Question

荫停留在越来越阵列 的json看起来像这样的选项，

{ 
    "data": [{ 
     "id": "36", 
     "combo_items": { 
      "type": "", 
      "combo": [""] 
     } 
    }, { 
     "id": "14", 
     "combo_items": { 
      "type": "combo", 
      "combo": [{ 
       "id": "12", 
       "name": "" 
      }, { 
       "id": "15", 
       "name": "test" 
      }] 
     } 
    }, 
    }]} 

我已经尝试过... 喜欢这些

  try { 

       JSONArray ja = response.getJSONArray("data"); 
       for (int i = 0; i < ja.length(); i++) 
       { 
        jo = (JSONObject) ja.get(i); 
        String id = jo.getString("id"); 

        JSONObject combo_items = jo.getJSONObject("combo_items"); 
        String combo_type = combo_items.getString("type"); 

        try { 
         JSONArray jsonArray = combo_items.getJSONArray("combo"); 
         for (int ii =0; ii<jsonArray.length(); ii++){ 
          jsonObject = (JSONObject) jsonArray.get(ii); 
          String combo_id = jsonObject.getString("id"); 
          String combo_name=jsonObject.getString("name"); 

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

如何从JSON数组内得到JSON对象，我想方法显示了一些错误 串canot被转换为JSONObject的 请帮助。

Answer 1

你可以试试opt代替get和检查空。

try { 

    JSONArray ja = response.optJSONArray("data"); 

    if (ja == null) { 
     return; 
    } 
    for (int i = 0; i < ja.length(); i++) { 
     JSONObject jo = ja.optJSONObject(i); 

     if (jo == null) { 
      continue; 
     } 

     String id = jo.optString("id"); 

     JSONObject combo_items = jo.optJSONObject("combo_items"); 
     String combo_type = combo_items.optString("type"); 

     try { 
      JSONArray jsonArray = combo_items.optJSONArray("combo"); 
      if (jsonArray != null) { 
       for (int ii = 0; ii < jsonArray.length(); ii++) { 
        JSONObject jsonObject = jsonArray.optJSONObject(ii); 
        if (jsonObject == null) { 
         continue; 
        } 
        String combo_id = jsonObject.getString("id"); 
        String combo_name = jsonObject.getString("name"); 

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

    } 
} catch (JSONException e) { 

}