Flutter 访问另一个类上的列表项
您好，我想知道如何在创建列表的其他类上访问列表的项目。特别是我想访问restaurantList在Restaurant Screen类上的项目Flutter 访问另一个类上的列表项,flutter,dart,Flutter,Dart,您好，我想知道如何在创建列表的其他类上访问列表的项目。特别是我想访问restaurantList在Restaurant Screen类上的项目 import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:projectfooddelivery/Src/models/restaurant.dart'; List<Restaurant> restaur
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:projectfooddelivery/Src/models/restaurant.dart';
List<Restaurant> restaurantList=[
Restaurant(image:"kfcloja.jpg",distance: "2 miles away",location:"Shoprite do magoanine",restaurantName: "KFC"),
Restaurant(image:"dominos.jpg",distance: "0.9 miles away",location:"Downtown",restaurantName: "Dominos"),
Restaurant(image:"kfclogo.png",distance: "2 miles away",location:"Shoprite do magoanine",restaurantName: "KFC"),
];//I would like to access the items on the list
class RestaurantWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
height: 350,
child: ListView.builder(
scrollDirection: Axis.vertical,
itemCount: restaurantList.length,
itemBuilder: (_, index) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
decoration: BoxDecoration(
border: Border.all(
width: 1.0,
color: Colors.grey[100]
),
borderRadius: BorderRadius.circular(20)
),
child: Row(
children: <Widget>[
Container(
width: 150,
child: ClipRRect(
borderRadius: BorderRadius.circular(20),
child: Image.asset("images/${restaurantList[index].image}",fit:BoxFit.cover ,)
)
),
Padding(
padding: const EdgeInsets.all(3.0),
child: Container(
padding: EdgeInsets.all(2),
height: 70,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text("${restaurantList[index].restaurantName}",style: TextStyle(fontWeight: FontWeight.bold),),
Row(
children: <Widget>[
Icon(Icons.star,size: 15,color:Colors.yellowAccent,),
Icon(Icons.star,size: 15,color:Colors.yellowAccent),
Icon(Icons.star,size: 15,color:Colors.yellowAccent),
Icon(Icons.star,size: 15,color:Colors.yellowAccent),
Icon(Icons.star_half,size: 15,color:Colors.yellowAccent),
],
),
Text("${restaurantList[index].location}"),
Text("${restaurantList[index].distance}"),
],
),
),
),
],
),
),
);
},
),
);
}
}
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:projectfooddelivery/Src/widgets/menu_widget.dart';
import 'package:smooth_star_rating/smooth_star_rating.dart';
class RestaurantScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
width: 400,
child: Column(
children: <Widget>[
Stack(
children: <Widget>[
Image.asset(
"images/kfcloja.jpg",
fit: BoxFit.cover,
),
Positioned(
child: IconButton(
icon: Icon(Icons.keyboard_arrow_left,size: 40,color: Colors.white,),
onPressed: (){},
),
top: 15,
)
],
),
Padding(
padding: const EdgeInsets.only(top: 14, left: 14, right: 14),
child: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Restaurant KFC",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
Text(
"0.2 miles away",
style: TextStyle(
fontSize: 16,
),
),
],
),
Align(
alignment: Alignment.topLeft,
child: SmoothStarRating(
allowHalfRating: false,
starCount: 5,
size: 20.0,
filledIconData: Icons.blur_off,
halfFilledIconData: Icons.blur_on,
color: Colors.yellowAccent,
borderColor: Colors.yellowAccent,
spacing: 0.0),
),
Align(
alignment: Alignment.topLeft,
child: Text("200 Main St, New york"),
),
Padding(
padding: const EdgeInsets.only(
left: 30, right: 30, top: 20, bottom: 5),
child: Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
FlatButton.icon(
shape: new RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(10.0),
),
color: Theme.of(context).primaryColor,
icon: Icon(
Icons.rate_review,
color: Colors.white,
),
label: Text(
'Reviews',
style: TextStyle(color: Colors.white),
),
onPressed: () {},
),
FlatButton.icon(
shape: new RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(10.0),
),
color: Theme.of(context).primaryColor,
icon: Icon(
Icons.contact_phone,
color: Colors.white,
),
label: Text(
'Contact',
style: TextStyle(color: Colors.white),
),
onPressed: () {},
)
],
),
),
),
Text(
"Menu",
textAlign: TextAlign.center,
style: TextStyle(fontSize: 20),
),
MenuWidget(),
],
)
),
)
],
),
),
);
}
}
您可以从一个屏幕向另一个屏幕发送和接收数据，如下所示，您需要使用导航器，在下面的示例中，我将数据从类A发送到类B，如下所示
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => B(bean: restaurantList[index])), //// HERE B IS THE CLASS ON WHICH YOU NEED TO CARRY DATA FROM CLASS A
);
class B extends StatefulWidget {
Restaurant bean;
B ({Key key, @required this.bean}) : super(key: key); ////YOU WILL GET THE DATA HERE FROM THE CONSTRUCTOR , AND USE IT INSIDE THE CLASS LIKE "widget.bean"
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _B();
}
}
你知道如何从RestaurantWidget打开RestaurantScreen吗？所以这是不可能的，对吧？？？如果我在餐馆屏幕上列出了列表，我可以从RestaurantWidget访问它？？？@ValdoAmaral请检查下面的解决方案，如果可能的话，请告诉我。检查Ravindra的答案。@ValdoAmaral如果对你们可行，请将答案标记为正确并投票表决
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'B.dart';
import 'Fields.dart';
class A extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _A();
}
}
class _A extends State<A> {
Widget build(BuildContext context) {
return MaterialApp(
title: 'Screen A',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primaryColor: Colors.red,
accentColor: Color(0xFFFEF9EB),
),
home: Scaffold(
appBar: new AppBar(),
body: Container(
margin: EdgeInsets.all(20.0),
child: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.all(10.0),
child: Text("Screen A"),
),
Expanded(
child: ListView.builder(
itemCount: fields.length,
itemBuilder: (BuildContext ctxt, int index) {
return ListTile(
title: new Text("Rating #${fields[index].rating}"),
subtitle: new Text(fields[index].title),
onTap: (){
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => B(bean: fields [index])), //// HERE B IS THE CLASS ON WHICH YOU NEED TO CARRY DATA FROM CLASS A
);
},
);
}),
)
],
),
)));
}
}
List<Fields> fields = [
new Fields(
'One',
1,
),
new Fields(
'Two',
2,
),
new Fields(
'Three',
3,
),
new Fields(
'Four',
4,
),
new Fields(
'Five',
5,
),
];
import 'package:flutter/material.dart';
import 'Fields.dart';
class B extends StatefulWidget{
Fields bean;
B ({Key key, @required this.bean}) : super(key: key); ////YOU WILL GET THE DATA HERE FROM THE CONSTRUCTOR , AND USE IT INSIDE THE CLASS LIKE "widget.bean"
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _B ();
}
}
class _B extends State<B> {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
title: 'Screen A',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primaryColor: Colors.red,
accentColor: Color(0xFFFEF9EB),
),
home: Scaffold(
appBar: new AppBar(),
body: Container(
margin: EdgeInsets.all(20.0),
child: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.all(10.0),
child: Center(
child: Text("Screen B" ,style: TextStyle(fontSize: 20.0),),
)
),
Text("Rating=>>> ${widget.bean.rating} and Title ${widget.bean.title} ")
],
),
)));
}
}
class Fields {
final String title;
final int rating;
Fields(this.title, this.rating);
}