我有一个待办事项应用程序，可在屏幕上列出所有待办事项 这是我的列表视图
class assignedTask extends StatefulWidget {
static const String id = 'assignedTask';
@override
_assignedTaskState createState() => _assignedTaskState();
}
class _assignedTaskState extends State<assignedTask> {
String Title;
String Summary;
var tasks;
crudMedthods crudObj = new crudMedthods();
var documentID;
var documents;
Future<bool> addDialog(BuildContext context) async {
return showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Add Data', style: TextStyle(fontSize: 15.0)),
content: Container(
height: 125.0,
width: 150.0,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
decoration: InputDecoration(hintText: 'Enter Title'),
onChanged: (value) {
this.Title = value;
},
),
SizedBox(height: 5.0),
TextField(
decoration: InputDecoration(hintText: 'Enter Summary'),
onChanged: (value) {
this.Summary = value;
},
),
],
),
),
actions: <Widget>[
FlatButton(
child: Text('Add'),
textColor: Colors.blue,
onPressed: () {
Navigator.of(context).pop();
crudObj.addData({
'Title': this.Title,
'Summary': this.Summary
}).then((result) {
dialogTrigger(context);
}).catchError((e) {
print(e);
});
},
)
],
);
});
}
Future<bool> updateDialog(BuildContext context, selectedDoc) async {
return showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Update Data', style: TextStyle(fontSize: 15.0)),
content: Container(
height: 125.0,
width: 150.0,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
decoration: InputDecoration(hintText: 'Title'),
onChanged: (value) {
this.Title = value;
},
),
SizedBox(height: 5.0),
TextField(
decoration: InputDecoration(hintText: 'Enter Summary'),
onChanged: (value) {
this.Summary = value;
},
),
],
),
),
actions: <Widget>[
FlatButton(
child: Text('Update'),
textColor: Colors.blue,
onPressed: () {
Navigator.of(context).pop();
crudObj.updateData(selectedDoc, {
'Title': this.Title,
'Summary': this.Summary
}).then((result) {
// dialogTrigger(context);
}).catchError((e) {
print(e);
});
},
)
],
);
});
}
Future<bool> dialogTrigger(BuildContext context) async {
return showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Job Done', style: TextStyle(fontSize: 15.0)),
content: Text('Added'),
actions: <Widget>[
FlatButton(
child: Text('Alright'),
textColor: Colors.blue,
onPressed: () {
Navigator.of(context).pop();
},
)
],
);
});
}
@override
void initState() {
crudObj.getData().then((results) {
setState(() {
tasks = results;
});
});
super.initState();
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
title: Text('Assigned Tasks'),
actions: <Widget>[
IconButton(
icon: Icon(Icons.add),
onPressed: () {
addDialog(context);
},
),
IconButton(
icon: Icon(Icons.refresh),
onPressed: () {
crudObj.getData().then((results) {
setState(() {
tasks = results;
});
});
},
)
],
),
body: _TaskList(),
);
}
Widget _TaskList() {
if (tasks != null) {
return StreamBuilder(
stream: tasks,
// ignore: missing_return
builder: (context, snapshot) {
if (snapshot.data != null) {
return ListView.builder(
itemCount: snapshot.data.documents.length,
padding: EdgeInsets.all(7.0),
itemBuilder: (context, i) {
return ListTile(
title: Text(snapshot.data.documents[i].data["Title"]??""),
subtitle: Text(snapshot.data.documents[i].data["Summary"]??""),
/*onTap: () {
*//*
updateDialog(
context, snapshot.data.documents[i].documentID);
},*/
onTap: (){
Navigator.push(context,MaterialPageRoute(builder:(context)=>DetailPage(snapshot.data.douments[i])));
}, onLongPress: () {
crudObj.deleteData(snapshot.data.documents[i].documentID);
},
);
},
);
}
return CircularProgressIndicator();
},
);
} else {
return Text('Loading, Please wait..');
}
}
}
当我按下ontap时，它应该转到详细信息页面，该页面仅显示特定任务的详细信息（注意：我现在仅具有值Title和summary，稍后我将添加其余内容，它们应显示在详细信息页面中） 我的详细视图如下
class DetailPage extends StatelessWidget {
DocumentSnapshot detailDocument;
DetailPage(this.detailDocument);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text( detailDocument.data["Title"]),
),
body: Center(
child: Text(detailDocument.data["Summary"]),
),
);
}
}
我遇到错误 在构建Builder（dirty）时引发了以下NoSuchMethodError：
“ QuerySnapshot”类没有实例获取程序“ douments”。 接收方：“ QuerySnapshot”的实例 尝试致电：douments 相关的引起错误的小部件是： MaterialApp文件：/// C：/Users/TRICON/AndroidStudioProjects/taskmanager/lib/main.dart：21：14 引发异常时，这是堆栈：
答案 0 :(得分：0)
您正在使用
Navigator.push(context,MaterialPageRoute(builder:(context)=>DetailPage(snapshot.data.douments[i])));
代替
Navigator.push(context,MaterialPageRoute(builder:(context)=>DetailPage(snapshot.data.documents[i])));
douments的拼写与documents只是不同。