Android的价值... java.lang.String类型不能转换成JSONArray

Question

有一个WCF从数据库中获取记录，并以JSON格式返回像这样我的项目：

{"GetNotesResult":"[{\"ID\":1,\"Title\":\"Note 1\",\"Content\":\"Hello Vu Chien Thang\",\"CreatedBy\":\"thangvc\"},{\"ID\":2,\"Title\":\"Note 2\",\"Content\":\"Hello Nguyen Thi Ngoc\",\"CreatedBy\":\"thangvc\"}]"} 

我也有一个机器人应用程序消耗的JSON，这是我的代码：

private JSONArray getNotes(String UserName, String Password) { 
     JSONArray jarray = null; 
     JSONObject jobj = null; 
     try{ 
      StringBuilder builder = new StringBuilder(URL); 
      builder.append("UserName=" + loggedInUser.getUserName()); 
      builder.append("&"); 
      builder.append("Password=" + loggedInUser.getPassword()); 

      HttpClient client = new DefaultHttpClient(); 
      HttpGet httpGet = new HttpGet(builder.toString()); 
      HttpResponse response = client.execute(httpGet); 

      int status = response.getStatusLine().getStatusCode(); 

      if(status==200) 
      { 
       HttpEntity entity = response.getEntity(); 
       String data = EntityUtils.toString(entity,"utf-8"); 
       jobj = new JSONObject(data); 
       jarray = jobj.getJSONArray("GetNotesResult"); 
      } 
      else 
      { 
       Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show(); 
      } 
     } 
     catch(ClientProtocolException e) 
     { 
      Log.d("ClientProtocol",e.getMessage()); 
     } 
     catch(IOException e) 
     { 
      Log.d("IOException", e.getMessage()); 
     } 
     catch(JSONException e) 
     { 
      Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show(); 
     } 
     catch(Exception e) 
     { 
      Log.d("Unhandle Error", e.getMessage()); 
     } 
     return jarray; 
    } 

我在jarray = jobj.getJSONArray("GetNotesResult");设置断点，并从JSONException此消息：

Value [{"ID":1,"Title":"Note 1","Content":"Hello Vu Chien Thang","CreatedBy":"thangvc"},{"ID":2,"Title":"Note 2","Content":"Hello Nguyen Thi Ngoc","CreatedBy":"thangvc"}] at GetNotesResult of type java.lang.String cannot be converted to JSONArray 

我试图复制JSON字符串并粘贴到在线JSON解析器网站http://jsonviewer.stack.hu/并且解析得很好。请帮我解决这个问题！

Answer 1

在你的JSON GetNotesResult值内""所以inclused它被认为是一个字符串，而不是一个数组..

被解析为一个数组应该..

{"GetNotesResult":[{\"ID\":1,\"Title\":\"Note 1\",\"Content\":\"Hello Vu Chien Thang\",\"CreatedBy\":\"thangvc\"},{\"ID\":2,\"Title\":\"Note 2\",\"Content\":\"Hello Nguyen Thi Ngoc\",\"CreatedBy\":\"thangvc\"}]} 

因此，解决办法是两件事之一：

1. 如果您可以修改服务器响应，请将json数组周围的""删除。 或

2. 解析它首先是作为字符串，然后从字符串创建一个JSON数组..

   String notes = jobj.getString("GetNotesResult"); 
   jarray = new JSONArray(notes); 
   

Answer 2

我试图将其粘贴到http://jsonviewer.stack.hu/并没有奏效。

使它工作我不得不更换所有\"到"然后[之前，从取出"符号和之后的]

这样的：

{"GetNotesResult":[{"ID":1,"Title":"Note1","Content":"HelloVuChienThang","CreatedBy":"thangvc"},{"ID":2,"Title":"Note2","Content":"HelloNguyenThiNgoc","CreatedBy":"thangvc"}]}