AsyncTask

    class LoadList extends AsyncTask<String, String, String> {

        @Override
        protected String doInBackground(String... strings) {

            RequestHttp request = new RequestHttp();

            BanhoTosaServices service =  request.getBanhoTosa();

            Call<BanhoTosaCatalog> requestCatalog = service.listBanhoTosa();

            requestCatalog.enqueue(new Callback<BanhoTosaCatalog>() {
                @Override
                public void onResponse(Call<BanhoTosaCatalog> call, Response<BanhoTosaCatalog> response) {


                    if(!response.isSuccessful()) {
                        Log.i("DUQUE", "Error: " + response.code());
                    }else {
                        //catalogs = response.body();
                        Tab1Fragment.this.getRequestData( response.body() );

                        for(BanhoTosa b : response.body().courses) {
                            data.add(new ListData(b.subtitle, R.drawable.cachorro));

                            data.clear();
                        }

                    }

                }

                @Override
                public void onFailure(Call<BanhoTosaCatalog> call, Throwable t) {
                    Log.e("DUQUE", "Error: " + t.getMessage());
                }
            });

            return null;
        }

        @Override
        protected void onProgressUpdate(String... values) {
            // updating UI from Background Thread
            ListViewAdapter adapter = new ListViewAdapter(Tab1Fragment.this.getActivity(), data);

            lv.setAdapter( adapter );
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog after getting all products
            //pDialog.dismiss();


        }
    }