Question

我想问我有一些json响应以及为什么我无法从jsonArray中获取值related_news

{
    "status": "Success",
    "message": "OK",
    "query": {
        "related": "true",
        "is_admin": true
    },
    "data": {
        "title": "Jadwal Pertandingan dan Siaran Langsung Grup D Piala Presiden 2018, Senin 29 Januari",
        "news_type": "Liga",
        "sub_news_type": "Liga Indonesia",
        "credit": "",
        "meta_description": "Jadwal Pertandingan dan Siaran Langsung Grup D Piala Presiden 2018, Senin 29 Januari",
        "recommended": "1",
        "tag": "Piala Presiden",
        "slug": "jadwal-pertandingan-dan-siaran-langsung-grup-d-piala-presiden-2018-senin-29-januari",
        "createon": "28 January 2018 20:09:31",
        "updateon": null,
        "publish_on": "2018-01-28 21:50:43",
        "news_like": 15,
        "news_smile": 0,
        "news_shock": 0,
        "news_inspired": 0,
        "news_happy": 0,
        "news_sad": 0,
        "news_fear": 0,
        "news_angry": 0,
        "news_fun": 0,
        "username": "bayu_m",
        "fullname": "Bayu Mahendra",
        "related_news": [
            {
                "title": "Bhayangkara FC Siapkan Taktik Sapu Jagat Lawan PSM",
                "slug": "bhayangkara-fc-siapkan-taktik-sapu-jagat-lawan-psm",
                "createon": "17 October 2017 14:47:56",
                "updateon": "",
                "publish_on": "2017-10-17 14:45:37",
                "news_view": 73
            }
     ]
    }
}

这里我的执行

    JSONObject result = new JSONObject(s);
            String status = result.get("status").toString(),
            message=result.getString("message");

// Log.d（＆＃34; log＆＃34;，＆＃34;结果：＆＃34; + s）;

            if(status.equals("Success")&& message.equals("OK")){
                Toast.makeText(ESNewsDetail.this,"wellcome"+result.getJSONObject("data").getString("fullname"),Toast.LENGTH_LONG).show();
                JSONObject data=result.getJSONObject("data");
                JSONArray arr=data.getJSONArray("related_news");
                String values=arr.getJSONObject(0).getString("id");
                for(int chcek=0;chcek<data.length();chcek++){
                    Toast.makeText(ESNewsDetail.this,"wellcome"+values,Toast.LENGTH_LONG).show();
                }
            //                    Toast.makeText(ESNewsDetail.this,"cxcxcx"+String.valueOf(data.getJSONArray("related_news").length()<0?"hmmm":"xxxxx"),Toast.LENGTH_LONG).show();

在这里错了在related_news中没有价值可以有人帮助我谢谢

Answer 1

使用result.getString("status")获取状态，因为状态是一个字符串（＆＃34;成功＆＃34;）

JSONObject result = new JSONObject(s);
String status = result.getString("status");
String message=result.getString("message");

检查此代码。

 JSONObject data=result.getJSONObject("data");
 JSONArray arr=data.getJSONArray("related_news");

for(int chcek=0;chcek<data.length();chcek++){
   Toast.makeText(ESNewsDetail.this,"wellcome"+values,Toast.LENGTH_LONG).show();     
}

data不是array

使用此

JSONArray arr=data.getJSONArray("related_news");
for(int chcek=0;chcek<arr.length();chcek++){
  JSONObject object = array.getJSONObject(check);
  String title  = object.getString("title");
  Toast.makeText(ESNewsDetail.this,title,Toast.LENGTH_LONG).show();
}

Answer 2

删除此行 - ：

String values=arr.getJSONObject(0).getString("id");

因为id不存在于相关的新闻数组中。请尝试存在的值。

例如 - ：

String values=arr.getJSONObject(0).getString("title");

执行将失败并且不会进一步移动，因此请删除该行。

Answer 3

删除此

arr.getJSONObject(0).getString("id");

id的密钥在相关的新闻对象中不存在，下一行是一个循环，所以除非第一个元素是特殊的，否则没有必要拥有getJSONObject(0)，或者你保证有它

事实上，您提供的任何数据中都没有id。

请仔细检查您的钥匙。

Answer 4

试试这个

JSONObject result = new JSONObject(s);
String status = result.getString("status");
String message = result.getString("message");

        Log.i("log", " result : " + result);

        Log.i("Status ", ":" + status);
        Log.i("Message ", ":" + message);


        if (status.equals("Success") && message.equals("OK")) {
            Toast.makeText(MainActivity.this, "wellcome" + result.getJSONObject("data").getString("fullname"), Toast.LENGTH_LONG).show();

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

            String title = data.getString("title");
            String news_type = data.getString("news_type");
            String sub_news_type = data.getString("sub_news_type");
            String credit = data.getString("credit");
            String username = data.getString("username");
            String fullname = data.getString("fullname");

            Log.i("Data Title ", ":" + title);
            Log.i("Data news_type ", ":" + news_type);
            Log.i("Data sub_news_type ", ":" + sub_news_type);
            Log.i("Data credit ", ":" + credit);
            Log.i("Data username ", ":" + username);
            Log.i("Data fullname ", ":" + fullname);


            JSONArray arr = data.getJSONArray("related_news");

            for (int chcek = 0; chcek < arr.length(); chcek++) {
                JSONObject jsonObject = arr.getJSONObject(chcek);

                String news_title = jsonObject.getString("title");
                String slug = jsonObject.getString("slug");
                String createon = jsonObject.getString("createon");
                String updateon = jsonObject.getString("updateon");
                String publish_on = jsonObject.getString("publish_on");
                String news_view = jsonObject.getString("news_view");

                Log.i("News Title ", ":" + news_title);
                Log.i("News slug ", ":" + slug);
                Log.i("News createon ", ":" + createon);
                Log.i("News updateon ", ":" + updateon);
                Log.i("News publish_on ", ":" + publish_on);
                Log.i("News news_view ", ":" + news_view);

                //Toast.makeText(MainActivity.this, title + "This is title value", Toast.LENGTH_LONG).show();
            }
        }

<强>输出

Answer 5

在代码中：

JSONArray arr=data.getJSONArray("related_news");
String values=arr.getJSONObject(0).getString("id");

有关键＆＃34; id＆＃34;。但字符串json没有密钥＆＃34; id＆＃34;。请将ID更改为标题以进行检查。

代码示例

 try {
        JSONObject result = new JSONObject(getResponse());
        String status = result.getString("status");
        String message = result.getString("message");

        if (!TextUtils.isEmpty(status) && !TextUtils.isEmpty(message)) {
            JSONObject data = result.getJSONObject("data");
            JSONArray arr = data.getJSONArray("related_news");
            for (int chcek = 0; chcek < arr.length(); chcek++) {
                String values = arr.getJSONObject(chcek).getString("title");
                Log.e("TAG", "welcome: " + values);
            }
        }
    }catch (Exception ex){
        Log.e("TAG", "error: " + ex.toString());
    }

Answer 6

请使用has（）方法，如果key存在则返回true，否则为

if (status.equals("Success") && message.equals("OK")) {
        Toast.makeText(ESNewsDetail.this, "wellcome" + result.getJSONObject("data").getString("fullname"), Toast.LENGTH_LONG).show();
        JSONObject data = result.getJSONObject("data");
        JSONArray arr = null;
        try {
            arr = data.getJSONArray("related_news");
            String values = arr.getJSONObject(0).has("id") ? arr.getJSONObject(0).getString("id") : "Key not found";
            Toast.makeText(ESNewsDetail.this, "wellcome" + values, Toast.LENGTH_LONG).show();
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

如何在jsonArray复杂中获取jsonObject

6 个答案: