[Release] Page Restoration Restore Freezes and throws Dart Error: Class not found in library ''.
#118565
Assignees
Labels
a: release
Challenges faced when attempting to productionize an app
a: state restoration
RestorationManager and related APIs
c: crash
Stack traces logged to the console
dependency: dart
Dart team may need to help us
found in release: 3.3
Found to occur in 3.3
found in release: 3.7
Found to occur in 3.7
framework
flutter/packages/flutter repository. See also f: labels.
has reproducible steps
The issue has been confirmed reproducible and is ready to work on
r: fixed
Issue is closed as already fixed in a newer version
Comments
Dart Error: Class not found in library ''.
|
I can reproduce the issue on both Steps to reproduce
Android
iOS
I suspect you should get the same error as you would on android. I attempted to attach to the Runner in xcode to see if I could get any logs but I had no success there. code sampleimport 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
restorationScopeId: 'app',
home: Banner(
message: kDebugMode ? 'DEBUG' : 'RELEASE',
location: BannerLocation.topEnd,
child: Scaffold(
appBar: AppBar(title: const Text('RestorableRouteFuture Example')),
body: const MyHome(),
),
),
);
}
}
class MyHome extends StatefulWidget {
const MyHome({super.key});
@override
State<MyHome> createState() => _MyHomeState();
}
class _MyHomeState extends State<MyHome> with RestorationMixin {
final RestorableInt _lastCount = RestorableInt(0);
late RestorableRouteFuture<int> _counterRoute;
@override
String get restorationId => 'home';
@override
void initState() {
super.initState();
_counterRoute = RestorableRouteFuture<int>(onPresent: (NavigatorState navigator, Object? arguments) {
// Defines what route should be shown (and how it should be added
// to the navigator) when `RestorableRouteFuture.present` is called.
return navigator.restorablePush(
_counterRouteBuilder,
arguments: arguments,
);
}, onComplete: (int count) {
// Defines what should happen with the return value when the route
// completes.
setState(() {
_lastCount.value = count;
});
});
}
@override
void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
// Register the `RestorableRouteFuture` with the state restoration framework.
registerForRestoration(_counterRoute, 'route');
registerForRestoration(_lastCount, 'count');
}
@override
void dispose() {
super.dispose();
_lastCount.dispose();
_counterRoute.dispose();
}
// A static `RestorableRouteBuilder` that can re-create the route during
// state restoration.
static Route<int> _counterRouteBuilder(BuildContext context, Object? arguments) {
return MaterialPageRoute<int>(
builder: (BuildContext context) => MyCounter(
title: arguments!.toString(),
),
);
}
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text('Last count: ${_lastCount.value}'),
ElevatedButton(
onPressed: () {
// Show the route defined by the `RestorableRouteFuture`.
_counterRoute.present('Awesome Counter');
},
child: const Text('Open Counter'),
),
],
),
);
}
}
// Widget for the route pushed by the `RestorableRouteFuture`.
class MyCounter extends StatefulWidget {
const MyCounter({super.key, required this.title});
final String title;
@override
State<MyCounter> createState() => _MyCounterState();
}
class _MyCounterState extends State<MyCounter> with RestorationMixin {
final RestorableInt _count = RestorableInt(0);
@override
String get restorationId => 'counter';
@override
void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
registerForRestoration(_count, 'count');
}
@override
void dispose() {
super.dispose();
_count.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
leading: BackButton(
onPressed: () {
// Return the current count of the counter from this route.
Navigator.of(context).pop(_count.value);
},
),
),
body: Center(
child: Text('Count: ${_count.value}'),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add),
onPressed: () {
setState(() {
_count.value++;
});
},
),
);
}
}
flutter doctor -v |
|
This is most definitely related to stronger tree-shaking - you can't expect to reflectively access any functions or classes from native side unless they are marked with |
|
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of |
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I have tried the sample given on this page regarding page restoration. When the application is running in debug mode (in app-debug.apk), the page restoration recovery is running. However, when the application is running in release (production) mode (in app-release.apk), the page restoration recovery freezes when switching from the application task via the multitask tray.
Steps to Reproduce
flutter create --sample=widgets.RestorableRouteFuture.1 mysamplefor creating project based on this sample.Result
In Debug Mode
Expected results: Success restore its state.
Actual results: Success restore its state.
Video demonstration source: Here
In Release Mode
Expected results: Success restore its state.
Actual results: The restoration process suddenly freezes (it's been 10 seconds and it's still freezing).
Video demonstration source: Here
APK Source
APK Debug (app-debug.apk): Here
APK Release (app-release.apk): Here
Log
Using
flutter doctor -vResult:
The text was updated successfully, but these errors were encountered: