Get properties of a JSON

According to your Json, it is an object that contains several objects, in this case usd and eur :

  

{ "usd" : {"code": "USD", "alphaCode": "USD", "numericCode": "840", "name": "U.S.        Dollar "," rate ": 0.062953567779141," date ":" Sun, 4 Dec 2016 12:00:01        GMT "},

     

"eur" : {"code": "EUR", "alphaCode": "EUR", "numericCode": "978", "name": "Euro", "rate" : 0.059052814030065, "date": "Sun,        4 Dec 2016 12:00:01 GMT "}
  }

What you need is to obtain the objects inside an object, which you can do by obtaining the keys and using an Iterator to obtain their data:

String valorName="";
String valorRate="";

   try {
            //    contenidoJson es tu string conteniendo el json.
            JSONObject mainObject = new JSONObject(contenidoJson);
            //Obtenemos los objetos dentro del objeto principal.
            Iterator<String> keys = mainObject.keys();

            while (keys.hasNext())
            {
                // obtiene el nombre del objeto.
                String key = keys.next();
                Log.i("Parser", "objeto : " + key);
                JSONObject jsonObject = mainObject.getJSONObject(key);

                //obtiene valores dentro del objeto.
                valorName = jsonObject.getString("name");
                valorRate = jsonObject.getString("rate");

                //Imprimimos los valores.
                Log.i("Parser", valorName);
                Log.i("Parser", valorRate);
            }
        } catch (JSONException e) {
            e.printStackTrace();
            Log.e("Parser", e.getMessage());
        }

As a result you would get:

Parser: objeto : usd
Parser: U.S. Dollar
Parser: 0.062953567779141
Parser: objeto : eur
Parser: Euro
Parser: 0.059052814030065

If you use Gson, what you can do is create an object that has the name and type of instance variables something equivalent to what you have in the json and then you can deserialize it using the methods provided by gson aca explain very well how to do it. I hope I have helped you