Android working with JSON

Question

I'd like to use a JSON to store 3 values more comfortable. The Values I want to store are String, String and Boolean. Where the first string should be used to identify the 3 values from other in the JSON.

At the end - after the user set his setting I would expect the json to look something like this:

{

    "Room1": 
        {
                "IP": "192.168.0.2",
                "use": "true"
        },  
    "Bathroom":
        {
                "IP": "192.168.0.3",
                "use": "false"
        },  
    "Kitchen":
        {
                "IP": "192.168.0.4",
                "use": "true"
        }

        .
        .
        .
        .
}

At the end I'd like to "easily" retrieve those values and change some of them (set use to false, for example).

note: That JSON will be converted to a string and saved in SharedPreferences for later usage.

What would be a good way to implement this? are thery any good tutorials or recommendeds libraries?

If using a json at this point isn't a good idea how else should I do this?

Answer 1

I think I'd rather use the following JSON:

{ "Rooms" : [
        {
                "Type" : "Room1",
                "IP"   : "192.168.0.2",
                "use"  : "true"
        },
        {
                "Type" : "Bathroom",
                "IP"   : "192.168.0.3",
                "use"  : "false"
        },
        {
                "Type" : "Kitchen",
                "IP"   : "192.168.0.4",
                "use"  : "true"
        }
    ]
}

with this POJO:

public class Room {

  @Expose
  private String Type;
  @Expose
  private String IP;
  @Expose
  private String use;

  public String getType() {
    return Type;
  }    

  public void setType(String Type) {
    this.Type = Type;
  }

  public String getIP() {
    return IP;
  }

  public void setIP(String IP) {
    this.IP = IP;
  }

  public String getUse() {
    return use;
  }

  public void setUse(String use) {
    this.use = use;
  }
}

added: Wrapping ArrayList for room list:

public class RoomList{

    @Expose
    private ArrayList<Room> Rooms = new ArrayList<Room>();

    public ArrayList<Room> getRooms() {
        return Rooms;
    }

    public void setRooms(ArrayList<Room> Rooms) {
        this.Rooms = Rooms;
    }
}

edited: and parse it vice versa with Gson:

String jsonString = "{ "Rooms" : [ { "Type" : "Room1", ... }, ... ] }";
RoomList rooms  = new RoomList();

Gson gson = new Gson();
rooms  = gson.fromJson(jsonString, rooms.getClass());

for (Room room : rooms.getRooms())
     System.out.println (room.getType());