I am trying to reopen last opened screen after boot, Is there any simple way to do so ? sample codes are welcome !
So far I tried a code(which I got somewhere) with SharedPreferences
, but it's not working.
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
String lastRouteKey = 'last_route';
void main() async {
SharedPreferences preferences = await SharedPreferences.getInstance();
String lastRoute = preferences.getString(lastRouteKey);
runApp(MyApp(lastRoute));
}
class MyApp extends StatelessWidget {
final String lastRoute;
MyApp(this.lastRoute);
@override
Widget build(BuildContext context) {
bool hasLastRoute = getWidgetByRouteName(lastRoute) != null;
return MaterialApp(
home: Foo(),
initialRoute: hasLastRoute ? lastRoute : '/',
onGenerateRoute: (RouteSettings route) {
persistLastRoute(route.name);
return MaterialPageRoute(
builder: (context) => getWidgetByRouteName(route.name),
);
},
);
}
Widget getWidgetByRouteName(String routeName) {
switch (routeName) {
case '/':
return MainWidget();
case '/':
return SecondRoute();
// Put all your routes here.
default:
return null;
}
}
void persistLastRoute(String routeName) async {
SharedPreferences preferences = await SharedPreferences.getInstance();
preferences.setString(lastRouteKey, routeName);
}
}
class Foo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Foo'),
),
body: Column(
children: <Widget>[
RaisedButton(
child: Text('Open route second'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
},
),
RaisedButton(
child: Text('Open route main'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MainWidget()),
);
},
),
],
),
);
}
}
class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Route"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
class MainWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("MainWidget"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
should I use SQLite
or JSON
instead of SharedPreferences
to make the code simple? thanks.