JSONArray 无法转换为 JSONObject 错误 [英] JSONArray cannot be converted to JSONObject error

问题描述

在获取 json 数据时出现错误:

While fetching json data I am getting error:

JSONArray 无法转换为 JSONObject

JSONArray cannot be converted to JSONObject

json 生成代码:

JSONObject parent = new JSONObject();
DatabaseHandler dbh = new DatabaseHandler(getApplicationContext());  
            for(int i=0; i < allEds.size(); i++){
                String edsText = allEds.get(i).getText().toString();                                           
               //spinner = allSpns.get(i);
               String spinSelected=allSpns.get(i).getSelectedItem().toString();                  
               try
                {
                   JSONObject json = new JSONObject();          
                   json.put("Id", i);
                   json.put("FieldName", edsText);
                   json.put("FieldType",spinSelected);
                   parent.accumulate("data", json);



                }
                catch (JSONException e)
                {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }                   

            }
Generated json is   
            {"data":
[{"FieldType":"Account Number","FieldName":"r","Id":0},
  {"FieldType":"Net      Banking Id","FieldName":"tt","Id":1}
 ]}
code for json read
------------------
JSONObject jsonObj = new JSONObject(folderStructure);
        JSONObject data = jsonObj.getJSONObject("data"); 
        String id = data.getString("Id"); 
        String value = data.getString("FieldName"); 
        Log.d("Item name: ", value);    

在阅读上述 json 时出现错误代码有什么问题吗??

While reading the above json am getting errors Any thing wrong with the code??

推荐答案

更改

JSONObject data = jsonObj.getJSONObject("data"); 

到

JSONArray data = jsonObj.getJSONArray("data");

因为数据的值是 JsonArray 而不是 JSONObject.

As value of data is JsonArray not JSONObject.

要获取单个 Id 和字段名称，您应该循环遍历此 JSONArray，如下所示:

And to Get individual Ids and Field Names, you should loop through this JSONArray, as follows:

for(int i=0; i<data.length(); i++)
{
     JSONObject obj=data.getJSONObject(i);
     String id = obj.getString("Id"); 
        String value = obj.getString("FieldName"); 
        Log.d("Item name: ", value);
}

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