Java representation of JSON Object

Question

I am trying to deserialize the following string, I am somewhat new to java and I cannot get this to work for the life of me... I am only trying to decode two strings in the object for now. My JSON and Java classes below. I am getting the result variable ok.

{
   "result": "true",
   "recentlyMarkedTerritories": {
      "0": {
         "pk_activity": "471",
         "fk_activity_type": "100",
         "activity_content": "Hhhhh",
         "fk_user": "2",
         "activity_image": "2_QZe73f4t8s3R1317230457.jpg",
         "created": "1317244857",
         "activity_status": "1",
         "activity_location_lat": "43.515283",
         "activity_location_lon": "-79.880678",
         "fk_walk": null,
         "fk_event_location": "73",
         "user_point": "0",
         "public_image": "0",
         "fk_event_location_lat": "43.515273",
         "fk_event_location_lon": "-79.879989",
         "profile_image": "2_y9JlkI3CZDml1312492743.jpg",
         "user_gender": "1",
         "user_dob": "236073600",
         "user_nickname": "junoman",
         "isFriend": "false",
         "profile_image_thumb": "2_y9JlkI3CZDml1312492743_t.jpg",
         "activity_image_thumb": "2_QZe73f4t8s3R1317230457_t.jpg",
         "relationship_status_idx": "2",
         "isBlocked": "false"
      },
      "1": {
         "pk_activity": "469",
         "fk_activity_type": "100",
         "activity_content": "Jsjsjs",
         "fk_user": "1",
         "activity_image": null,
         "created": "1317244508",
         "activity_status": "1",
         "activity_location_lat": "43.515283",
         "activity_location_lon": "-79.880678",
         "fk_walk": null,
         "fk_event_location": "73",
         "user_point": "0",
         "public_image": "0",
         "fk_event_location_lat": "43.515273",
         "fk_event_location_lon": "-79.879989",
         "profile_image": "1_4Cpkofueqnrb1316895161.jpg",
         "user_gender": "1",
         "user_dob": "116841600",
         "user_nickname": "JoePennington",
         "isFriend": "false",
         "profile_image_thumb": "1_4Cpkofueqnrb1316895161_t.jpg",
         "activity_image_thumb": null,
         "relationship_status_idx": "1",
         "isBlocked": "false"
      },
      .....
   }
}

And my java class below

RecentActivity infoList = null;
Gson gson = new Gson();
infoList = gson.fromJson(JSONString, RecentActivity.class);

public class RecentActivity {
    String result;
    recentlyMarkedTerritories recentlyMarkedTerritories = null;

    public RecentActivity() {

    }

    public class recentlyMarkedTerritories {
        public Set<recentlyMarkedTerritories> pk_activity = new HashSet<recentlyMarkedTerritories>() ;

        public recentlyMarkedTerritories() {    }
    }
}

Please forgive my lack of description but I'm sure the code helps. The JSON is already used in other applications so changing it is not an option.. :(

Thanks!

Answer 1

Here are some nice Tutorials for JSON that will help you out.

GSON

JSON

JSON Example with source code

UPDATED

Try like this,

 try {
            JSONObject object = new JSONObject(jsonString);
            JSONObject myObject = object.getJSONObject("recentlyMarkedTerritories");

            for (int i = 0; i < object.length(); i++) {
                JSONObject myObject2 = myObject.getJSONObject(Integer.toString(i));
                System.out.println(myObject2.toString(2));  
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

Answer 2

I am not sure of the gson code to write, but the structure of your json looks more like the following java representation (though you might want booleans and ints instead of String fields):

public class RecentActivity {
    String result;
    Map<String,RecentlyMarkedTerritory> recentlyMarkedTerritories = null;
}

public class RecentlyMarkedTerritory {
    String pk_activity;
    // other fields
}