Recyclerview içerisinde apiden gelen verileri listelemekte sorun yaşıyorum.

Recyclerview içerisinde apiden gelen verileri listelemekte sorun yaşıyorum. Yardımcı olabilir misiniz? 

Kodlarım aşağodaki gibidir;

public class MainActivity extends AppCompatActivity {
    public static String apikey = "123456789";
    public static String lan = "55.5";
    public static String lon="37.5";
    public static String cnt="10";
    private List<CountryData> list;
    SearchView searchView;
    RecyclerView countries;
    TextView countryName, temperature;
    ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        searchView = (SearchView) findViewById(R.id.searchView);
        countries = (RecyclerView) findViewById(R.id.countries);
        countryName = (TextView) findViewById(R.id.countryName);
        temperature = (TextView) findViewById(R.id.temperature);
        image = (ImageView) findViewById(R.id.image);


        list = new ArrayList<>();
        countries = findViewById(R.id.countries);
        countries.setLayoutManager(new LinearLayoutManager(this));
        countries.setHasFixedSize(true);


        Adapter adapter = new Adapter(this, list);
        countries.setAdapter(adapter);


        ApiUtilities.getApiInterface().getCountryData(lan,lon,cnt,apikey).enqueue(new Callback<List<CountryData>>(){

            @Override
            public void onResponse(Call<List<CountryData>> call, Response<List<CountryData>> response) {
                if (response.code() == 200) {
                    RetrofitModel retrofitModel = (RetrofitModel) response.body();
                    assert retrofitModel != null;
                    double temp = retrofitModel.main.temp - 273.15;
                    int tempToInt = (int) temp;

                    String country = retrofitModel.sys.country;
                    for(int i=0; i<list.size(); i++){
                        countryName.setText(country);
                    }

                    String temperatures = tempToInt + "°C";
                    temperature.setText(temperatures);

                }
            }

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

            }
        });


    }

}