下面是我使用SOLID原则做一些网络工作的代码

class AddressDateLogic {
    AddressDateLogic({
      required this.apiLayer,
      required this.responseValidator,
    });

    /// PROPERTIES

    HttpApi apiLayer;
    IResponseValidator responseValidator;

    /// METHODS

    Future<void> getAllAddresses(
        String authToken,
        Function(bool isSuccess, String? errorMessage, List<AddressModel> data)
            onResponse) async {
      /// API CALLBACK

      var validator = responseValidator.validateResponse(
        response: await apiLayer.getHttp(
            endPoint: ApiEndpoints.getAllAddress,
            headers: {"authorization": "Bearer $authToken"}),
      );

      if (validator.status == ResponseStatus.success) {
        List<dynamic> allAddresses = validator.data!['data'];
        List<AddressModel> addresses = [];
        for (var element in allAddresses) {
          addresses.add(
            AddressModel.fromJson(element)..active = element['is_active'],
          );
        }

        onResponse(true, null, addresses);
      } else {
        onResponse(false, validator.errorMessage, []);
      }
    }
  }

你可以从这里了解依赖注入原理。