dart - 有没有一种方法可以使用我的刷新指示器在错误快照之后刷新 future builder

Question

我正在从Newsapi.org提取数据，我需要能够在出现快照错误后重新加载futurebuilder()，所以我非常陌生，所以这听起来很奇怪。
我已经能够获取我的数据，并且还尝试将 call 重新放入if(snapshot.hasError) {}但是我无法使它工作

Widget build(BuildContext context) {
var refreshIndicator = RefreshIndicator(
        key: refreshKey,
        child: FutureBuilder<List<Source>>(
          future: list_sources,
          builder: (context, snapshot) {
            if (snapshot.hasError) {
              return Text(
                  'An error occured, check your internet connection and try again');
            }
            if (snapshot.hasData) {
              if (snapshot.data != null) {
                List<Source> sources = snapshot.data;
                return new ListView(
                    children: sources
                        .map((source) => GestureDetector(
                              onTap: () {
                                Navigator.push(
                                    context,
                                    MaterialPageRoute(
                                        builder: (context) =>
                                            ArticleScreen(source: source)));
                              },
                              child: Card(
                                elevation: 1.0,
                                color: Colors.white,
                                margin: const EdgeInsets.symmetric(
                                    vertical: 8.0, horizontal: 14.0),
                                child: Row(
                                  crossAxisAlignment:
                                      CrossAxisAlignment.start,
                                  children: <Widget>[
                                    Container(
                                      margin: const EdgeInsets.symmetric(
                                          vertical: 20.0, horizontal: 4.0),
                                      width: 100.0,
                                      height: 140.0,
                                      child: Image.asset(
                                          "lib/images/newspaper 2.png"),
                                    ),
                                    Expanded(
                                      child: Column(
                                        crossAxisAlignment:
                                            CrossAxisAlignment.start,
                                        children: <Widget>[
                                          Row(
                                            children: <Widget>[
                                              Expanded(
                                                child: Container(
                                                  margin:
                                                      const EdgeInsets.only(
                                                          top: 20.0,
                                                          bottom: 10.0),
                                                  child: Text(
                                                    '${source.name}',
                                                    style: TextStyle(
                                                        fontSize: 18.0,
                                                        fontWeight:
                                                            FontWeight
                                                                .bold),
                                                  ),
                                                ),
                                              ),
                                            ],
                                          ),
                                          Container(
                                            child: Text(
                                              '${source.description}',
                                              style: TextStyle(
                                                  fontSize: 12.0,
                                                  fontWeight:
                                                      FontWeight.bold,
                                                  color: Colors.grey),
                                            ),
                                          ),
                                          Container(
                                            child: Text(
                                              '${source.category}',
                                              style: TextStyle(
                                                  fontSize: 14.0,
                                                  fontWeight:
                                                      FontWeight.bold,
                                                  color: Colors.black),
                                            ),
                                          ),
                                        ],
                                      ),
                                    ),
                                  ],
                                ),
                              ),
                            ))
                        .toList());
              }
            } else {
              return CircularProgressIndicator();
            }
          },
        ),
        onRefresh: refreshListSource,
      );

我希望从屏幕顶部开始滑动并出现错误，以尝试重新加载数据

Answer 1

@Sebastian将refreshKey置于build方法之外，重建时屏幕不会回到顶部。

  var refreshKey = GlobalKey<RefreshIndicatorState>();

  @override
  Widget build(BuildContext context) {
    ...
  }