flutter, adding a PageRouteBuilder - flutter

Question

I am trying to modify my Navigation Transition code to use PageRouteBuilder. See method _gotoThirdPage().
The problem is that I cannot pass parameters to new Page. For example, I crash when passing title. Also looking for examples of sending multiple parameters, such as a map.
REQUEST: Could someone Modify the _gotoThirdPage() method to send parameters to Class SecondPage.
//====================. Code below ===================
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
// Added ===
routes: <String, WidgetBuilder>{
SecondPage.routeName: (BuildContext context) => new SecondPage(title: "SecondPage"),
},
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new RaisedButton(
onPressed: _gotoSecondPage,
child: new Text("Goto SecondPage- Normal"),
),
new RaisedButton(onPressed: _gotoThirdPage,
child: new Text("goto SecondPage = with PRB"),
),
new Text(
'You have pushed the button this many times:',
),
new Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: new FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: new Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
void _gotoSecondPage() {
//=========================================================
// Transition - Normal Platform Specific
print('==== going to second page ===');
print( SecondPage.routeName);
Navigator.pushNamed(context, SecondPage.routeName);
}
void _gotoThirdPage() {
//=========================================================
// I believe this is where I would be adding a PageRouteBuilder
print('==== going to second page ===');
print( SecondPage.routeName);
//Navigator.pushNamed(context, SecondPage.routeName);
//=========================================================
//=== please put PageRouteBuilderCode here.
final pageRoute = new PageRouteBuilder(
pageBuilder: (BuildContext context, Animation animation,
Animation secondaryAnimation) {
// YOUR WIDGET CODE HERE
// I need to PASS title here...
// not sure how to do this.
// Also, is there a way to clean this code up?
return new SecondPage();
},
transitionsBuilder: (BuildContext context, Animation<double> animation,
Animation<double> secondaryAnimation, Widget child) {
return SlideTransition(
position: new Tween<Offset>(
begin: const Offset(1.0, 0.0),
end: Offset.zero,
).animate(animation),
child: new SlideTransition(
position: new Tween<Offset>(
begin: Offset.zero,
end: const Offset(1.0, 0.0),
).animate(secondaryAnimation),
child: child,
),
);
},
);
Navigator.of(context).push(pageRoute);
}
}
class SecondPage extends StatefulWidget {
SecondPage({Key key, this.title}) : super(key: key);
static const String routeName = "/SecondPage";
final String title;
#override
_SecondPageState createState() => new _SecondPageState();
}
/// // 1. After the page has been created, register it with the app routes
/// routes: <String, WidgetBuilder>{
/// SecondPage.routeName: (BuildContext context) => new SecondPage(title: "SecondPage"),
/// },
///
/// // 2. Then this could be used to navigate to the page.
/// Navigator.pushNamed(context, SecondPage.routeName);
///
class _SecondPageState extends State<SecondPage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
//======== HOW TO PASS widget.title ===========
title: new Text(widget.title),
//title: new Text('==== second page ==='),
),
body: new Container(),
floatingActionButton: new FloatingActionButton(
onPressed: _onFloatingActionButtonPressed,
tooltip: 'Add',
child: new Icon(Icons.add),
),
);
}
void _onFloatingActionButtonPressed() {
}
}

Answer 1

I am not quite sure what you are trying to do. The easiest way to pass parameters to new Page for me is using the constructor of the new page if I need to do some processing- show/ use/ pass them later on. Although I dont think it is appropriate if you have large number of parameters.
So in some cases I would use SharedPrefences. I think this will be better for sending multiple parameters, such as a map.
Btw about your navigation I advise you to use Navigate with named routes. Something like:
MaterialApp(
// Start the app with the "/" named route. In our case, the app will start
// on the FirstScreen Widget
initialRoute: '/',
routes: {
// When we navigate to the "/" route, build the FirstScreen Widget
'/': (context) => FirstScreen(),
// When we navigate to the "/second" route, build the SecondScreen Widget
'/second': (context) => SecondScreen(),
},
);
And then:
Navigator.pushNamed(context, '/second');
Documentation.