dart - flutter ScrollView 不滚动

Question

我有这个

  Widget _Project() {
return new ListView(
        children: <Widget>[
          Container(
            child: Card(
              color: _Cardcolor,
              child: Center(
                child: Text(
                  'Projects',
                  style: new TextStyle(
                    fontSize: 40.0,
                  ),
                ),
              ),
            ),
            margin: EdgeInsets.only(left: 50.0, right: 50.0, top: 10.0),
            height: 130.0,
            width: 15.0,
          ),
          Divider(
            height: 40,
          ),
          Container(
            child:  FutureBuilder<List<Project>>(
              future: fetchProjects(http.Client()),
              builder: (context, snapshot) {
                if (snapshot.hasError) print(snapshot.error);
                return snapshot.hasData
                    ? ProjectList(projects: snapshot.data)
                    : Center(child: CircularProgressIndicator());
              },
            ),
          )
        ],
    ) ;
  }

这是 builder

class ProjectList extends StatelessWidget {
  final List<Project> projects;
  ProjectList({Key key, this.projects}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      shrinkWrap: true,
      itemCount: projects.length,
      itemBuilder: (context, index) {
        return Column(
          children: <Widget>[
            Container(
                color: Colors.white10,
                alignment: Alignment.center,
                child: Card(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      ListTile(
                        title: Text(projects[index].ProjectId),
                        subtitle: Text(projects[index].ProjectId),
                      ),
                      ButtonTheme.bar(
                        // make buttons use the appropriate styles for cards
                        child: ButtonBar(
                          children: <Widget>[
                            FlatButton(
                              child: const Text('Open'),
                              onPressed: () {/* ... */},
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                )),
          ],
        );
      },
    );
  }
}

所以，我正在用卡片创建列表。这是截图

数据来自 json，并且显示正确。好吧，它没有正确显示，因为我有 5 个而它只显示 3 个，这是因为滚动问题。当我缩小卡片时，我的所有数据都会显示出来。

我已经尝试添加这一行

 physics: const AlwaysScrollableScrollPhysics()

但仍然没有帮助，我现在卡住了

我该如何解决？我错过了什么吗？

Answer 1

在你的类(class) - ProjectList() - ListView.builder - 添加 - physics: ClampingScrollPhysics(),

Widget build(BuildContext context) {
    return ListView.builder(
      physics: ClampingScrollPhysics(),  // add this
      shrinkWrap: true,
      itemCount: projects.length,
      itemBuilder: (context, index) {
        return Column(
          children: <Widget>[ ...

更新: 要使 card list 仅滚动而不是整个页面 - 将顶部 Listview 替换为 column。

return Scaffold(
      body: Column(   // replace from listview
        children: <Widget>[
          SizedBox(height: 15.0,),
          Container(
            child: Card(
              //  color: _Cardcolor,
              child: Text(
                'Projects',
                style: new TextStyle(
                  fontSize: 44.0,
                ),
              ),
            ),
            margin: EdgeInsets.only(left: 50.0, right: 50.0, top: 15.0),
            height: 130.0,
           // width: 15.0,
          ),
          Divider(
            height: 40,
          ),
          Expanded( // add Expanded
            child: Container(
              child: ProjectList(
                projects: ['anmol', 'anmol', 'dummy', 'demo'],
              ),
//            child: FutureBuilder<List<Project>>(
//              future: fetchProjects(http.Client()),
//              builder: (context, snapshot) {
//                if (snapshot.hasError) print(snapshot.error);
//                return snapshot.hasData
//                    ? ProjectList(projects: snapshot.data)
//                    : Center(child: CircularProgressIndicator());
//              },
//            ),
            ),
          )
        ],
      ),