Android : Parse JSON data with several data types into database table from Android app?

I have created a data object model:

package com.example.apex.apex ;

import java.sql.Date ;

public class Cyclist {

    enum Gender {

        Male, Female
    }

    enum Location {

        Antrim, Armagh, Carlow, Cavan, Clare,
        Cork, Derry, Donegal, Down, Dublin,
        Fermanagh, Galway, Kerry, Kildare,
        Kilkenny, Laois, Leitrim, Limerick,
        Longford, Louth, Mayo, Meath, Monaghan,
        Offaly, Roscommon, Sligo, Tipperary,
        Tyrone, Waterford, Westmeath, Wexford,
        Wicklow
    }

    String firstName;
    String lastName;
    String emailAddress;
    String password;
    Location county;
    Date birthDate;
    Gender gender;
    int heightCm;
    double weightKg;

    // constructor
    public Cyclist() {

    }

    public Cyclist(String fName, String lName, String email,
            String password, Location county, Date dob,
            Gender gender, int height, double weight) {

        this.firstName = fName;
        this.lastName = lName;
        this.emailAddress = email;
        this.password = password;
        this.county = county;
        this.birthDate = dob;
        this.gender = gender;
        this.heightCm = height;
        this.weightKg = weight;
    }

    @Override
    public String toString() {
        return String.format("First Name: " + this.firstName + ", Last Name: " + this.lastName
                + ", Email Address: " + this.emailAddress + ", Password: " + this.password
                + ", County: " + this.birthDate + ", Gender: " + this.gender + ", Height: "
                + heightCm + ", Weight: " + weightKg);
    }

}

I also have a JSONParser class:

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
            Log.e("JSON", json);
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}

CyclistFunctions.java

package com.example.apex.apex ;

public class CyclistFunctions {

    private JSONParser jsonParser;

    private static final String registerURL = "http://127.0.0.1/apexdb/include/db_functions.php/";
    private static final String loginURL = "http://127.0.0.1/apexdb/include/db_functions.php/";

    private static String register_tag = "register";
    private static String login_tag = "login";

    // constructor
    public CyclistFunctions() {
        jsonParser = new JSONParser();
    }

    /** public JSONObject loginCyclist(String email_address, String password) { // build parameters
     * List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("tag",
     * login_tag)); params.add(new BasicNameValuePair("email_address", email_address)); params.add(new
     * BasicNameValuePair("password", password)); JSONObject json = jsonParser.getJSONFromUrl(loginURL, method,
     * params); }
     * <p>
     * /**
     * make register request
     */
    public JSONObject registerUser(String fName, String lName, String bio) {
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("tag", register_tag));
        params.add(new BasicNameValuePair("first_name", fName));
        params.add(new BasicNameValuePair("last_name", lName));
        //etc

        JSONObject json = jsonParser.getJSONFromUrl(registerURL, params);

        return json;
    }

}

If my database table consisted only of string values it would be fine as I would parse my data directly to JSON, however as I need to convert multiple data types, how might I go about this? I looked at Gson, however it was not very clear to me.