当我在浏览器中使用此代码输出时,断言失败:不正确。通常是这样的,因为数据没有发送到列表视图,对吗?但是哪里出了问题?
══╡小工具库引起的异常CA ═════════════════════ 引发以下断言以构建ItemActivity(dirty):断言 失败:不是真的
这是我调用API时的代码
FutureBuilder(
future: UserController.getActivity(_selectedUser),
builder: (context, snapshot) {
if (snapshot.hasError) print(snapshot.error);
return snapshot.hasData
? new ItemActivity(
list: snapshot.data,
)
: new Center(
child: CircularProgressIndicator(),
);
}),
此代码我在页面底部,确实在窗口小部件之外
class ItemActivity extends StatelessWidget {
final List list;
ItemActivity({this.list});
@override
Widget build(BuildContext context) {
return new ListView.builder(
itemCount: list == null ? 0 : list.length,
itemBuilder: (context, i) {
Map<String, dynamic> activity = list[i]['activity'];
return new Container(
padding: EdgeInsets.all(10.0),
child: Container(
child: Card(
child: new ListTile(
title: Text(activity.containsKey("project")
? activity["project"]
: "-"),
subtitle: Text("created at : ${list[i]['created_at']}"),
)),
),
);
},
);
}
}
答案 0 :(得分:0)
尝试将您的ItemActivity()的构造函数更改为此:
ItemActivity({Key key, this.list}) : super(key: key);