Android：改造：多個連續的異步請求。 Тoo許多嵌套項目

Question

com.squareup.retrofit2:retrofit:2.3.0 

我的步驟：

1. 開始異步請求：getCompaniesList（）
2. 等待成功響應
3. 啓動另一個異步請求：getCatalogsList（）
4. 等待成功響應
5. 做一些其他的代碼

這裏摘錄我的活動：

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) { 

      } 
     }); 

我覺得這個結構不是很好。 Т多個嵌套物品。由於結果代碼更復雜。

問題：這個結構有其他選擇嗎？

Answer 1

您可以花時間去學習的Rx RXjava2

，也可以分散你這樣的代碼

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) { 

     } 
    }; 
}