在这段代码中，flutter中的dio包如何将base-url与url和apikey连接起来？

Question

flutter中的音频包如何将base-url与这段代码中的url和apikey连接起来。我对音频包的工作原理有点困惑，有人能帮帮我吗

如果我有一个这样的URL

BaseURL = "https://newsapi.org/"
apkikey = "256c198308134b578e338737a895"
url= "v2/top-headlines?country=us"

dio包如何将上述三个组件结合在一起，以生成如下所示的这种url

https://newsapi.org/v2/top-headlines?country=us&apikey=256c198308134b578e338737a895

任何帮助都将不胜感激

Answer 1

就像这样，ArticleResponse就是模型

BaseURL = "https://newsapi.org/v2/"
getTopHeadLinesUrl = "$BaseURL/top-headlines";
apkikey = "256c198308134b578e338737a895"

Future<ArticleResponse> getTopHeadlines() async {
    var params = {"apiKey": apikey, "country": "us"};
    try {
      Response response = await _dio.get(getTopHeadLinesUrl, queryParameters: params);
      return ArticleResponse.fromJson(response.data);
    } catch (e) {
      return ArticleResponse.withError(e.toString());
    }
  }

Example:
    "https://newsapi.org/v2/top-headlines?country=us&apiKey=509ea7c380274d5b9ae18c7a3fe9af7c"

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