JSONException：尝试从 JSON 检索数据时出现问题

Question

好的，所以我正在尝试从 JSON 的列表中提取数据，例如：

{"code":200,"status":"OK","data":{"timings":{"Fajr":"04:17","Sunrise":"05:30","Dhuhr":"12:20","Asr":"15:42","Sunset":"19:11","Maghrib":"19:11","Isha":"20:24","Imsak":"04:07","Midnight":"00:20"},"date":{"readable":"17 Jun 2017","timestamp":"1497652236"}}}

专门针对特定的祈祷。我查找数据的代码如下：

 class SaveTheFeed extends AsyncTask<Void, Void, Void>{
    String jsonString = "";
    String result = "";
    EditText chosenCity = (EditText) findViewById(R.id.editText3);
    String city = chosenCity.getText().toString();

    @Override
    protected Void doInBackground(Void... voids) {
        DefaultHttpClient httpClient = new DefaultHttpClient(new BasicHttpParams());
        HttpPost httpPost = new HttpPost("http://api.aladhan.com/timingsByCity?city=" + city + "&country=AE&method=2");
        httpPost.setHeader("Content-type", "application/json");
        InputStream inputStream;

        try{
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            inputStream = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
            StringBuilder builder = new StringBuilder();
            String line;
            while ((line = reader.readLine()) !=null){
                builder.append(line + "\n");
            }
            jsonString = builder.toString();

            JSONObject jObject = new JSONObject(jsonString);

            JSONObject data = (JSONObject) jObject.get("data");

            JSONArray jArray = (JSONArray) data.get("timings");

            outputTimings(jArray);

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

        return null;
    }
    @Override
    protected void onPostExecute(Void aVoid) {
        TextView prayerTimes = (TextView) findViewById(R.id.prayerTimes);
        prayerTimes.setText(result);
    }

    protected void outputTimings(JSONArray jsonArray){
        String[] prayers= {"Fajr", "Sunrise", "Dhuhr", "Asr", "Sunset", "Maghrib", "Isha", "Imsak", "Midnight"};
        try{
            for(int i = 0; i < jsonArray.length(); i++){
                JSONObject cityObject =
                        jsonArray.getJSONObject(i);
                result = result +  prayers[i] + " : "+
                         cityObject.getString(prayers[i]) + "\n";
            }

我收到指向第 85 行的错误（JSONObject jObject = new JSONObject(jsonString); 行）

06-17 00:24:15.973 2866-2907/azanmute.android.com.azanmute W/System.err: org.json.JSONException: java.lang.String 类型的值无法转换为 JSONObject 06-17 00:24:15.973 2866-2907/azanmute.android.com.azanmute W/System.err: 在 org.json.JSON.typeMismatch(JSON.java:111) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 org.json.JSONObject.(JSONObject.java:160) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 org.json.JSONObject.(JSONObject.java:173) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 azanmute.android.com.azanmute.MainActivity$SaveTheFeed.doInBackground(MainActivity.java:85) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 azanmute.android.com.azanmute.MainActivity$SaveTheFeed.doInBackground(MainActivity.java:60) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 android.os.AsyncTask$2.call(AsyncTask.java:305) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 java.util.concurrent.FutureTask.run(FutureTask.java:237) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 06-17 00:24:15.974 2866-2907/azanmute.android.com.azanmute W/System.err: at java.lang.Thread.run(Thread.java:761)

所以我的理解是我错误地指向数据或将 JSONObjects 与 JSONArrays 混合在一起。我已经尝试过this 和this，但仍然收到相同的错误。

Answer 1

在这种情况下，您没有混淆 JSON 对象和 JSON 数组。这绝对是一个 JSONObject。

您可能在字符串中添加了 JSONObject 构造函数不喜欢的“不可见”字符（即“\n”）。试试这个：

JSONObject jObject = new JSONObject(jsonString.substring(jsonString.indexOf("{"), jsonString.lastIndexOf("}") + 1));

另外请注意，“计时”也是一个 JSONObject 而不是 JSONArray。 JSONArray 示例，其中“cars”是 JSONArray：

{"name":"John","age":30,"cars":[ "Ford", "BMW", "Fiat" ]}