Android：Retrofit：多个连续的异步请求。 Тoo许多嵌套项目

Question

com.squareup.retrofit2:retrofit:2.3.0

我的步骤：

1. 启动异步请求：getCompaniesList（）
2. 等待成功回复
3. 启动另一个异步请求：getCatalogsList（）
4. 等待成功回复
5. 做一些其他代码

我的活动中的代码段：

 RestClient restClient = RestClientFactory.getRestClient();
        Call<List<Company>> companyList = restClient.getCompaniesList(filters);

        companyList.enqueue(new Callback<List<Company>>() {
            @Override
            public void onResponse(Call<List<Company>> call, Response<List<Company>> response) {
                if (response.isSuccessful()) {
                    RestClient restClient = RestClientFactory.getRestClient();

                    Call<List<Catalog>> catalogList = restClient.getCatalogsList(filters);
                    catalogList.enqueue(new Callback<List<Catalog>>() {
                        @Override
                        public void onResponse(Call<List<Catalog>> call, Response<List<Catalog>> response) {
                            if (response.isSuccessful()) {
                                // HERE SOME NEED CODE!!!
                            }
                        }

                        @Override
                        public void onFailure(Call<List<Catalog>> call, Throwable throwable) {

                        }
                    });
                }
            }

            @Override
            public void onFailure(Call<List<Company>> call, Throwable throwable) {

            }
        });

我觉得这个结构不是很好。 Тoo许多嵌套项目。结果代码更复杂。

问题：有这种结构的替代方案吗？

Answer 1

您可以花时间学习Rx RXjava2

或者您可以像这样拆分代码

RestClient restClient = RestClientFactory.getRestClient();
Call<List<Company>> companyList = restClient.getCompaniesList(filters);

companyList.enqueue(getCompanyListCallback());

private Callback<List<Company>> getCompanyListCallback() {
    return new Callback<List<Company>>() {
        @Override
        public void onResponse(Call<List<Company>> call, Response<List<Company>> response) {
            if (response.isSuccessful()) {
                RestClient restClient = RestClientFactory.getRestClient();
                Call<List<Catalog>> catalogList = restClient.getCatalogsList(filters);
                catalogList.enqueue(getCatalogsListCallback());
            }
        }

        @Override
        public void onFailure(Call<List<Company>> call, Throwable throwable) {

        }
    };
}

private Callback<List<Catalog>> getCatalogsListCallback() {
  return   new Callback<List<Catalog>>() {
        @Override
        public void onResponse(Call<List<Catalog>> call, Response<List<Catalog>> response) {
            if (response.isSuccessful()) {
                // HERE SOME NEED CODE!!!
            }
        }

        @Override
        public void onFailure(Call<List<Catalog>> call, Throwable throwable) {

        }
    };
}