Getting property of an object which has non-fixed keys

Question

Assume that I get this JSon Response from webservice:

{
    "id":13,
    "name":"Alireza",
    "required_id":"14",
    "all_friends_id_and_name":{
        "28":"Hassan",
        "21":"Mohammad",
        "68":"Ali",
        "14":"Taha",
        "96":"Darya"
    }
}

In this response required_id value specifies that I need a friend name with id 14, so in all_friends_id_and_name object I should get the value of "14" (Taha) and use it in my app.

I'm using retrofit2 and gson libraries.

How to get property of an object which has non-fixed keys?

see https://stackoverflow.com/questions/20419217/to-get-all-the-keys-in-jsonobject-into-string-array and https://stackoverflow.com/questions/7091054/how-i-can-get-all-the-keys-from-a-string-which-somehow-looks-like-json-string , I dont think gson can be used — Manohar, Sep 10 '18 at 07:15

IntelliJ Amiya · Accepted Answer · 2020-03-23T02:22:45.140

2

For Native approach, You can Try with Iterator .

An iterator is an object that enables a programmer to traverse a container, particularly lists.

 "all_friends_id_and_name":{
        "28":"Hassan",
        "21":"Mohammad",
        "68":"Ali",
        "14":"Taha",
        "96":"Darya"
    }

For the above section, Your LOGIC will be

     JSONObject jsonData = new JSONObject("Json_response");
          Iterator  iteratorObj = jsonData .keys();
           while (iteratorObj.hasNext())
            {
                String str_json_Key = (String)iteratorObj.next();
                 // Print=28,21....96
             }

edited Mar 23 '20 at 02:22

answered Sep 10 '18 at 07:17

IntelliJ Amiya

74,896
15
165
198

so there is no solution using gson library? and if the answer is "No", how to get "all_friends_id_and_name" value as string? it's a retrofit request. – Alireza Noorali Sep 10 '18 at 07:59
1

@AlirezaNoorali Sorry sir, AFAIK, Retrofit will not help for this case. – IntelliJ Amiya Sep 10 '18 at 08:08
1

It doesn't solve, yet. As you said Retrofit will not help for this case, So I decided to tell webservice developers to change the webservice response. – Alireza Noorali Sep 11 '18 at 06:05
@AlirezaNoorali Solved now? – IntelliJ Amiya Sep 12 '18 at 10:43
1

Yes, it has solved. we changed the response. thank you – Alireza Noorali Sep 12 '18 at 12:58
1

@AlirezaNoorali Move ahead. – IntelliJ Amiya Sep 12 '18 at 13:03

score 0 · Answer 2 · answered Sep 10 '18 at 07:21

Here is your Json:

{
    "id":13,
    "name":"Alireza",
    "required_id":"14",
    "all_friends_id_and_name":{
        "28":"Hassan",
        "21":"Mohammad",
        "68":"Ali",
        "14":"Taha",
        "96":"Darya"
    }
}

Try by doing like this :

 try {

     JSONObject jsonObject; // it should be your above JsonObject 

            Iterator<?> keys = jsonObject.keys();

            while (keys.hasNext()) {
                String key = (String) keys.next();
                System.out.println("Mykey: " + key + " value: " + jsonObject.getString(key));    
            }


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

Getting property of an object which has non-fixed keys

2 Answers2