java - org.json.JSONException 值 java.lang.String 类型的连接无法转换为 JSONArray

Question

JSON 数据:

{
"data": [
 {
   "id": 5,
   "name": "Deal One"
 },
 {
   "id": 6,
   "name": "Deal Two"
 },
 {
   "id": 7,
   "name": "Deal Three"
 }
]
}

onPostExecute，其中 JSONArray 被转换。

    @Override
    protected void onPostExecute(String result) {

        //this method will be running on UI thread
        ArrayList<String> dataList = new ArrayList<String>();
        pdLoading.dismiss();


        if(result.equals("no rows")) {

            // Do some action if no data from database

        }else{

            try {

                JSONArray jArray = new JSONArray(result);

                // Extract data from json and store into ArrayList
                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject json_data = jArray.getJSONObject(i);
                    dataList.add(json_data.getString("name"));
                }

                strArrData = dataList.toArray(new String[dataList.size()]);

            } catch (JSONException e) {
                // You to understand what actually error is and handle it appropriately
                Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
                Toast.makeText(MainActivity.this, result.toString(), Toast.LENGTH_LONG).show();
            }

        }

    }

所有这一切背后的重要理念是什么？在 this tutorial 之后进行自动完成演出.我注意到他们的 JSON 看起来与我的非常不同。

如何修复 JSONArray 错误？

EDIT2

STACKTRACE:(编辑 3:当我遵循其他人的代码时会发生以下错误)

01-19 14:41:15.442 6513-6513/gsi.xform W/System.err: org.json.JSONException: Value Connection of type java.lang.String cannot be converted to JSONObject
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at org.json.JSON.typeMismatch(JSON.java:111)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:160)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:173)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at gsi.xform.MainActivity$AsyncFetch.onPostExecute(MainActivity.java:385)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at gsi.xform.MainActivity$AsyncFetch.onPostExecute(MainActivity.java:288)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.os.AsyncTask.finish(AsyncTask.java:651)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.os.AsyncTask.-wrap1(AsyncTask.java)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.os.Looper.loop(Looper.java:148)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5417)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
01-19 14:41:15.448 6513-6513/gsi.xform W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

EDIT4:

这是 doInBackground 代码:

    @Override
    protected String doInBackground(String... params) {
        try {

            // Enter URL address where your php file resides or your JSON file address
            url = new URL("http://myprivate.url?X-Authorization=token");

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return e.toString();
        }
        try {

            // Setup HttpURLConnection class to send and receive data from php and mysql
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(READ_TIMEOUT);
            conn.setConnectTimeout(CONNECTION_TIMEOUT);
            conn.setRequestMethod("GET");

            // setDoOutput to true as we receive data
            conn.setDoOutput(true);
            conn.connect();

        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return e1.toString();
        }

        try {

            int response_code = conn.getResponseCode();

            // Check if successful connection made
            if (response_code == HttpURLConnection.HTTP_OK) {

                // Read data sent from server
                InputStream input = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                StringBuilder result = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                // Pass data to onPostExecute method
                return (result.toString());

            } else {
                return("Connection error");
            }

        } catch (IOException e) {
            e.printStackTrace();
            return e.toString();
        } finally {
            conn.disconnect();
        }


    }

Answer 1

result 是 JSONObject 而不是 JSONArray

   // fetch the object      
    JSONObject obj = new JSONObject(result);

   // fetch the data array
    JSONArray jArray = obj.getJSONArray("data");

    // Extract data from json and store into ArrayList
    for (int i = 0; i < jArray.length(); i++) {
        JSONObject json_data = jArray.getJSONObject(i);
        dataList.add(json_data.getString("name"));
    }

---

{                     // beginning of JSONObject
"data": [             // nested JSONArray
 {                    // nested JSONObject inside JSONArray
   "id": 5,  
   "name": "Deal One"
 },
 {
   "id": 6,
   "name": "Deal Two"
 },
 {
   "id": 7,
   "name": "Deal Three"
 }
]
}  // ending of JSONObject

信息:另一个问题是由于Runtime-Permission执行流程的实现意味着在建立互联网连接时未给予许可。