Android Question B4A & (local) php & MySql Server

[Schakalaka]

Hello.
i have follow this tutorial, and i'm try to modify the example filefrom this post:

https://www.b4x.com/android/forum/threads/complete-tutorial-b4a-your-own-local-php-mysql-server-xampp-with-b4a.48635/

i need to pick a single value from table. The table is for user fields and have many fields like (name, surname,,address, city, energy, etc.)

i would like pick the value "energy" from name with id "pippo"

So this is my code:

Public Sub pickEnergy

    Dim DoUsersEnergy As HttpJob
    DoUsersEnergy.Initialize("", Me)
    DoUsersEnergy.download2("http://192.168.1.43/persons/persons.php", Array As String ("action", "GetUserEnergy","deviceid",functions.GetDeviceId))
    Wait For (DoUsersEnergy) JobDone(DoUsersEnergy As HttpJob)
    If DoUsersEnergy.Success Then
    Dim res As String
        res = DoUsersEnergy.GetString
        Log("Back from Job:" & DoUsersEnergy.JobName )
    Log("Response from server: " & res)
                Dim l As List
                l.Initialize  
    Dim parser As JSONParser
    parser.Initialize(res)
      [S]  l.Add(parser.NextValue)  [/S]l.Add(parser.NextObject) ' suggest from [B][USER=73327]le_toubib[/USER][/B]

    Log(l.Size)  
Log(l.Get(0))
        energy_Label.Text =  "Total energy: " & l.Get(0) & "/50"

   
Else
        ToastMessageShow("Error: " & DoUsersEnergy.ErrorMessage, True)
End If
    DoUsersEnergy.Release
       
End Sub

on php file, this is the code:

 case "GetUserEnergy":
    $txtdeviceid =$_GET["deviceid"];
        $q = mysqli_query($con,"SELECT my_energy FROM tbl_users WHERE my_deviceid = '$txtdeviceid'" );
        $rows = array();
        print json_encode($q);

     break;

now, onthe edittext, it show:

{current_field=null, field_count=null, lengths=null, num_rows=null, type=null}

But no other errors