How to show data in list in android using json retuned by .asmx webservice

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]

public class Service : System.Web.Services.WebService
{
    List<wilaya> Wilayalist = new List<wilaya>();
    List<moughata> Moughataalist = new List<moughata>();
    List<commune> Communelist = new List<commune>();
    public Service () {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string HelloWorld() {
        return "Hello World";
    }

    [WebMethod]
    public List<wilaya> GetWilaya()
    {
        // getting connection string
       
        string conStr = WebConfigurationManager.ConnectionStrings["SQLDbConnection"].ConnectionString;
        DataTable dt = new DataTable();
        SqlDataReader dr = null;
        // Creating Sql Connection
        using (SqlConnection conn = new SqlConnection(conStr))
        {
            // Creating insert statement
            string sql = string.Format(@"Select * from [WilayaMast]");
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.Text;
            conn.Open();

            dr = cmd.ExecuteReader();
            dt.Load(dr);
            conn.Close();
            cmd = null;
        }

        int countRow = dt.Rows.Count;

        foreach (DataRow drEmp in dt.Rows)
        {
            Wilaya objwilaya = new Wilaya();
            objwilaya.WCode = Convert.ToInt32(drEmp["Wcode"].ToString());
            objwilaya.WName = drEmp["WName"].ToString();
            objwilaya.WID = drEmp["WID"].ToString();
            Wilayalist.Add(objwilaya);
        }
        return Wilayalist;
    }

    [WebMethod]
    public List<commune> GetCommune()
    {
        // getting connection string

        string conStr = WebConfigurationManager.ConnectionStrings["SQLDbConnection"].ConnectionString;
        DataTable dt = new DataTable();
        SqlDataReader dr = null;
        // Creating Sql Connection
        using (SqlConnection conn = new SqlConnection(conStr))
        {
            // Creating insert statement
            string sql = string.Format(@"Select * from [CommuneMast]");
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.Text;
            conn.Open();

            dr = cmd.ExecuteReader();
            dt.Load(dr);
            conn.Close();
            cmd = null;
        }

        int countRow = dt.Rows.Count;

        foreach (DataRow drcommune in dt.Rows)
        {
            Commune objcommune = new Commune();
            objcommune.CCode = Convert.ToInt32(drcommune["CCode"].ToString());
            objcommune.CName = drcommune["CName"].ToString();
            objcommune.CID = drcommune["CID"].ToString();
            objcommune.MCode = Convert.ToInt32(drcommune["MCode"]);
            Communelist.Add(objcommune);
        }
        return Communelist;
    }

    [WebMethod]
    public List<moughata> GetMoughata()
    {
        // getting connection string

        string conStr = WebConfigurationManager.ConnectionStrings["SQLDbConnection"].ConnectionString;
        DataTable dt = new DataTable();
        SqlDataReader dr = null;
        // Creating Sql Connection
        using (SqlConnection conn = new SqlConnection(conStr))
        {
            // Creating insert statement
            string sql = string.Format(@"Select * from [MoughataaMast]");
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.Text;
            conn.Open();

            dr = cmd.ExecuteReader();
            dt.Load(dr);
            conn.Close();
            cmd = null;
        }

        int countRow = dt.Rows.Count;

        foreach (DataRow drmoughata in dt.Rows)
        {
            Moughata objmoughata = new Moughata();
            objmoughata.MCode = Convert.ToInt32(drmoughata["MCode"].ToString());
            objmoughata.MID = drmoughata["MID"].ToString();
            objmoughata.WCode = Convert.ToInt32(drmoughata["WCode"].ToString());
            objmoughata.MName = drmoughata["MName"].ToString();
            Moughataalist.Add(objmoughata);
        }
        return Moughataalist;
    }
}