How do I convert a JSONObject to class object?

Question

I need to convert a JSONObject to a Location object using gson libraries for an android project of mine. I'm not sure on how to do this. Can anyone help me with this. Thanks in advance.

I have a code something like

JSONArray input = new JSONArray(extras.getString("loc_json"));

I wanted to convert the JSONObject taken from the JSONArray to a Location class object. I just wanted to know whether there is a function that does it directly.

Pardon me if I framed the question in a wrong way. Since I haven't got the direct function, I did it in this way.

 loc_temp = (Location) gson.fromJson(input.getJSONObject(i).toString(), Location.class);;

Sorry for the stupid question.

score 54 · Accepted Answer · edited May 20 '17 at 15:50

54

Here's a tutorial for GSON - I think it should help bolster your understanding. Essentially the parsing is done like this:

String mJsonString = "...";
JsonParser parser = new JsonParser(); 
JsonElement mJson =  parser.parse(mJsonString);
Gson gson = new Gson();
MyDataObject object = gson.fromJson(mJson, MyDataObject.class);

edited May 20 '17 at 15:50

Deepak Goel

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answered Mar 07 '13 at 21:40

JRaymond

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It should be "new JsonParser().parse(...)".. spent few minutes trying to figure out what the problem was – Lampione Apr 27 '16 at 18:18

score 13 · Answer 2 · answered Feb 07 '17 at 03:05

13

if you still want to use org.json.JSONObject:

org.json.JSONObject o;
ObjectMapper m = new ObjectMapper();
MyClass myClass = m.readValue(o.toString(), MyClass.class);

answered Feb 07 '17 at 03:05

electrobabe

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what is ObjectMapper here..? – Anukool srivastav Jun 04 '18 at 05:10
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I guess:com.fasterxml.jackson.databind.ObjectMapper – billschen Feb 17 '19 at 04:42
How is it connected to gson? – user996142 Jan 10 '20 at 23:59

score 3 · Answer 3 · answered May 20 '13 at 05:43

use com.google.gson.JsonObject & JsonArray instead of org.json.*

like this :

Gson gson = new Gson();
Type typeOfT = new TypeToken<List<Location.class>>(){}.getType();
JsonParser parser = new JsonParser();
JsonObject jo = (JsonObject) parser.parse(jsonStr);
JsonArray ja = jo.getAsJsonArray("memberName");
list = gson.fromJson(ja, typeOfT);

score 2 · Answer 4 · answered Aug 19 '21 at 11:01

Convert JSONObject to Model class::

val jsonObject = JSONObject(data[0].toString())
val jsonModel = jsonObject.getJSONObject(KEY.message).toString()
val chatModel = Gson().fromJson(model, ChatModel::class.java))

Prakash Reddy · Answer 5 · 2020-02-17T09:47:20.443

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For kotlin

 val objType = object : TypeToken<MyClass>() {

    }.getType()
    var myclassObj = gson.fromJson(value,objType)

or

 val objectResponse = Gson().fromJson(Gson().toJson(resp), MyClass::class.java)

edited Feb 17 '20 at 09:47

answered Feb 17 '20 at 09:39

Prakash Reddy

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How do I convert a JSONObject to class object?

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