read php session from android

[sripadraj kudur]

Hello there,

I am doing an application where i am reading certain data from server and i'm able to retrieve data from the server through json parsing and displaying them in a listview. When I click on an item i'm performing the following function

 try{
         httpclient=new DefaultHttpClient();
         httppost= new HttpPost("http://10.0.2.2/android/cart.php?action=add&id="+id); // make sure the url is correct.
       
         nameValuePairs = new ArrayList<NameValuePair>(1);
      
         nameValuePairs.add(new BasicNameValuePair("id",id));  // $Edittext_value = $_POST['Edittext_value'];
         httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
   
         response=httpclient.execute(httppost);

         HttpEntity entity = response.getEntity();
         is = entity.getContent();
         
     }catch(Exception e){
         System.out.println("Exception : " + e.getMessage());
     }

i'm posting values to a php server program like this:
<? ... session_start(); // Process actions $newcart = ''; $cart = $_SESSION['cart']; $_SESSION['my_orders']; $action = $_GET['action']; switch ($action) { case 'add': if ($cart) { $cart .= ','.$_GET['id']; } else { $cart = $_GET['id']; } break; ... $_SESSION['cart'] = $cart; ?>


which will add the item to a session in the php and each time i send a data to the server the session variable seems to be over written by the new value posted.
i need all the session variable posted. What should be done in case i need to read session variables.

Thank you