How to transform Json into an object with dynamic fields using Gson on Android?

Question

I have the following json:

{"Data" :{ "Description": "app", "Campo2": "app2", "Campo3": "app3"}, "Instring" : "1", "Token" : "Zoebarw9nimk9o"}

The "Date" field may contain 1:N fields.

To illustrate, I tried to assemble the following class structure:

class JsonDynamicData {
        Map<String, String> info;
    }

    class JsonDynamicClass {

        JsonDynamicData Data;
        int inString;
        String token;           

        public JsonDynamicClass() {
            Data = new JsonDynamicData();
        }
    }

    private void jsonDinamico() {
        //TODO
        try {

            String json = IOUtils.toString(getActivity().getResources().openRawResource(R.raw.jsonmoredata));

            JsonDynamicClass toJson = new Gson().fromJson(json, JsonDynamicClass.class);                

        } catch (IOException e) {
        }
    }

However the conversion of Json to my object did not work.

How should I proceed to create an object structure where the "Date" field can receive 1:N fields?

Answer 1

It is necessary to use Gson?

Because Android has the Jsonobject, that already does something similar to what you want, transforming the string JSON, in a tuple object, you can do something similar to this:

String str = "{'nome': 'Fernando', 'idade': 25}";
JSONObject json;
try {
    json = new JSONObject(str);
    int idade = json.getInt("idade");
    String nome = json.getString("nome");
} catch (JSONException e) {
    e.printStackTrace();
}

The Gson, Google, is great, to use when your JSON, corresponds to a class model of your project, as it manages to do all this conversion for you. In your case it seems to me more appropriate to use the Jsonobject even.