new AsyncTask<Void, Void, ArrayList<Barang>>() {
            //didalam doInBackground tidak boleh akses tampilan
            @Override
            protected ArrayList<Barang> doInBackground(Void... voids) {
                ArrayList<Barang> hasil = new ArrayList<>();
                hasil.addAll(Arrays.asList(db.barangDAO().selectAllBarangs()));
                return hasil;
            }

            @Override
            protected void onPostExecute(ArrayList<Barang> barangs) {
                arrid.clear();
                for(Barang b : barangs){
                    arrid.add(String.valueOf(b.getId_barang()) + " - " + String.valueOf(b.getNama_barang()));
                }
                spinadapter.notifyDataSetChanged();
            }
        }.execute();