android web services

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Java

Mobile

Android

This is my code.

private String get()
   {

       String response = "";
       try
       {

           URL connectURL = new URL("http://localhost:8182/lightControlPage/statusAll");
           HttpURLConnection conn = (HttpURLConnection)connectURL.openConnection();
           // do some setup
           conn.setDoInput(true);
           conn.setDoOutput(true);
           conn.setUseCaches(false);
           conn.setRequestMethod("GET");
           // connect and flush the request out
           conn.connect();
           conn.getOutputStream().flush();
           // now fetch the results
           response = getResponse(conn);
           Displaymsg(response);
           }
           catch(Exception ex)
           {
               return ex.getMessage();
           }
       return response;
       //return response;
     }
private String getResponse(HttpURLConnection conn)
   {
       InputStream is = null;
       try
       {
           is = conn.getInputStream();
          return is.toString();
       }
       catch(Exception e)
       {
       }
       finally
       {
       }

       return is.toString();
   }

This result in unknown protocol localhost, and when i change localhost to http:// valid ip address it returns null. when i do it from the browser it works as it gives a string in return in json format. Any help?