安卓pie上的Retrofit2响应为空

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'

import retrofit2.Call;
import retrofit2.http.GET;

public interface ApiService {
    @GET("endpoint")
    Call<ResponseBody> getData();
}

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class RetrofitClient {
    private static Retrofit retrofit = null;

    public static Retrofit getClient(String baseUrl) {
        if (retrofit == null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {
    private ApiService apiService;

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

        String baseUrl = "https://api.example.com/";
        apiService = RetrofitClient.getClient(baseUrl).create(ApiService.class);

        Call<ResponseBody> call = apiService.getData();
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                if (response.isSuccessful()) {
                    try {
                        String jsonData = response.body().string();
                        // 处理 JSON 数据
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } else {
                    // 处理错误
                }
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                // 处理失败
            }
        });
    }
}