在Android原生开发中,页面跳转用Intent类实现
Intent intent =new Intent(MainActivity.this,SecondActivity.class);
startActivity(intent);
而在安卓原生开发中，页面传值有多种方法，常见的可以用intent、Bundle、自定义类、静态变量等等来传值。
Flutter提供了两种方法路由，分别是 Navigator.push() 以及 Navigator.pushNamed() 。ci
此文基于 Flutter版本 Channel stable，v1.9.1+hotfix.2
页面跳转
构建路由Navigator.push()
- Navigator.push()
从第一个页面(FirstPage())跳转到第二个页面(SecondPage())
// Within the `FirstPage` widget
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondPage()),
);
}
- 使用
Navigator.pop()回到第一个页面(FirstPage())
// Within the SecondPage widget
onPressed: () {
Navigator.pop(context);
}
命名路由Navigator.pushNamed()
- Navigator.pushNamed()
首先需要定义一个routes
MaterialApp(
// home: FirstPage(),
// Start the app with the "/" named route. In this case, the app starts
// on the FirstPage widget.
initialRoute: '/',
routes: {
// When navigating to the "/" route, build the FirstPage widget.
'/': (context) => FirstPage(),
// When navigating to the "/second" route, build the SecondPage widget.
'/second': (context) => SecondPage(),
},
);
注意这里定义了
initialRoute之后，就不能定义home'属性。应该把之前定义的home属性注释掉。initialRoute属性不能与home`共存，只能选一个。
- 从第一个页面(FirstPage())跳转到第二个页面(SecondPage())
// Within the `FirstPage` widget
onPressed: () {
// Navigate to the second page using a named route.
Navigator.pushNamed(context, '/second');
}
- 使用
Navigator.pop()回到第一个页面(FirstPage())
// Within the SecondPage widget
onPressed: () {
Navigator.pop(context);
}
传值跳转
构建路由Navigator.push()
- 首先定义需要传的值
// You can pass any object to the arguments parameter.
// In this example, create a class that contains a customizable
// title and message.
class ScreenArguments {
final String title;
final String message;
ScreenArguments(this.title, this.message);
}
- 第二个页面(SecondPage())接受传值
// A widget that extracts the necessary arguments from the ModalRoute.
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
// Extract the arguments from the current ModalRoute settings and cast
// them as ScreenArguments.
final ScreenArguments args = ModalRoute.of(context).settings.arguments;
return Scaffold(
appBar: AppBar(
title: Text(args.title),
),
body: Center(
child: Text(args.message),
),
);
}
}
- 从第一个页面(FirstPage())传值
onPressed: () {
// When the user taps the button, navigate to the specific route
// and provide the arguments as part of the RouteSettings.
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => SecondPage(),
// Pass the arguments as part of the RouteSettings. The
// ExtractArgumentScreen reads the arguments from these
// settings.
settings: RouteSettings(
arguments: ScreenArguments(
'Extract Arguments Screen',
'This message is extracted in the build method.',
),
),
),
);
}
命名路由Navigator.pushNamed()
- 首先定义需要传的值
// You can pass any object to the arguments parameter.
// In this example, create a class that contains a customizable
// title and message.
class ScreenArguments {
final String title;
final String message;
ScreenArguments(this.title, this.message);
}
- 其次定义一下
routes
MaterialApp(
// Provide a function to handle named routes. Use this function to
// identify the named route being pushed, and create the correct
// Screen.
onGenerateRoute:
(settings) {
// If you push the PassArguments route
if (settings.name == "/passArguments") {
// Cast the arguments to the correct type: ScreenArguments.
final ScreenArguments args = settings.arguments;
// Then, extract the required data from the arguments and
// pass the data to the correct screen.
return MaterialPageRoute(
builder: (context) {
return SecondPage(
title: args.title,
message: args.message,
);
},
);
}
},
);
- 第二个页面(SecondPage())接受传值
// A Widget that accepts the necessary arguments via the constructor.
class SecondPage extends StatelessWidget {
final String title;
final String message;
// This Widget accepts the arguments as constructor parameters. It does not
// extract the arguments from the ModalRoute.
//
// The arguments are extracted by the onGenerateRoute function provided to the
// MaterialApp widget.
const SecondPage({
Key key,
@required this.title,
@required this.message,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Center(
child: Text(message),
),
);
}
}
- 从第一个页面(FirstPage())传值
onPressed: () {
// When the user taps the button, navigate to a named route
// and provide the arguments as an optional parameter.
Navigator.pushNamed(
context,
"/passArguments",
arguments: ScreenArguments(
'Accept Arguments Screen',
'This message is extracted in the onGenerateRoute function.',
),
);
}
第三方插件
Fluro是Flutter路由库
添加方式
dependencies:
fluro: "^1.5.1"
使用例子
import 'package:flutter/material.dart';
import 'app_route.dart';
import 'package:fluro/fluro.dart';
void main() {
router.define('home/:data', handler: new Handler(
handlerFunc: (BuildContext context, Map params) {
return new Home(params['data'][0]);
}));
runApp(new Login());
}
class Login extends StatefulWidget{
@override
createState() => new LoginState();
}
class LoginState extends State{
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Fluro 例子',
home: new Scaffold(
appBar: new AppBar(
title: new Text("登录"),
),
body: new Builder(builder: (BuildContext context) {
return new Center(child:
new Container(
height: 30.0,
color: Colors.blue,
child:new FlatButton(
child: const Text('传递帐号密码'),
onPressed: () {
var bodyJson = '{"user":Manjaro,"pass":passwd123}';
router.navigateTo(context, '/home/$bodyJson');
},
)),
);
}),
));
}
}
class Home extends StatefulWidget{
final String _result;
Home(this._result);
@override
createState() => new HomeState();
}
class HomeState extends State{
@override
Widget build(BuildContext context) {
return new Center(
child: new Scaffold(
appBar: new AppBar(
title: new Text("个人主页"),
),
body:new Center(child: new Text(widget._result)),
)
);
}
}
'app_route.dart'的代码:
import 'package:fluro/fluro.dart';
Router router = new Router();
Reference
fluro
官方文档
flutter移动开发中的页面跳转和传值