dialog

public class FilterDialog extends DialogFragment {
    private List<Countries> countriesList = new ArrayList<>();
    private ApiService service;
    private AutoCompleteTextView autoCompleteTextView;
    private List<Countries.CountriesData> countriesData = new ArrayList<>();
    private Countries data;
    private AutoCompleteCountryAdapter adapter;
    private Call<Countries> call;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        service = RetrofitBuilder.createService(ApiService.class);

        getCountries();
    }

    private void getCountries() {
        call = service.getCountries();
        call.enqueue(new Callback<Countries>() {
            @Override
            public void onResponse(Call<Countries> call, Response<Countries> response) {
                if (response.isSuccessful()) {
                    data = response.body();
                    countriesData.addAll(data.getCountriesData());
                    adapter.setCountryListFull(countriesData);
                }
            }

            @Override
            public void onFailure(Call<Countries> call, Throwable t) {

            }
        });
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_filter, container);
        autoCompleteTextView = view.findViewById(R.id.actv_countries);
        adapter = new AutoCompleteCountryAdapter(getContext() ,countriesData);
        autoCompleteTextView.setAdapter(adapter);
        return view;
    }

}