MainActivity.java

        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if (s != null) {
                try {
                    JSONArray scheduleJsonList = new JSONArray(s);
                    RoutesAdapter mAdapter = new RoutesAdapter(scheduleJsonList);
                    mRoutesList.setAdapter(mAdapter);
                } catch (JSONException e) {
                    Log.e(TAG, e.getMessage());
                }
            }
        }