public static String callJson(String urlstring){
        String data=null;
        try {
            URL url = new URL(urlstring);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(10000 /* milliseconds */);
            conn.setConnectTimeout(15000 /* milliseconds */);
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            // Starts the query
            conn.connect();
         InputStream stream = conn.getInputStream();

      data = convertStreamToString(stream);
         stream.close();

         }catch(SocketTimeoutException e){
                //failed
         }
        catch (Exception e) {
            e.printStackTrace();
         }

        return data;

    }

    static String convertStreamToString(java.io.InputStream is) {
          java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
          return s.hasNext() ? s.next() : "";
       }