MitsuraIvan commented 2 years ago

lifecycle: 0.4.4

Launch-> crash


class ScreenSplash{
  static final navigationKey = GlobalKey<NavigatorState>();
}
...
MaterialApp(
        navigatorObservers: [defaultLifecycleObserver],
        home: ExternalWidget(),
)...

class ExternalWidget extends StatelessWidget {
  final LifecycleObserver lifecycleObserver = LifecycleObserver();

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        SizedBox(
          width: double.infinity,
          child: WidgetBackground(),
        ),
        WillPopScope(
          child: Navigator(
            key: ScreenSplash.navigationKey,
            observers: [lifecycleObserver],
            onGenerateRoute: (route) {
              if (route.name == "/") return MaterialPageRoute(builder: (ctx) => SubMain());
              if (route.name == "crash") return MaterialPageRoute(builder: (ctx) => CrashWidget());
            },
            initialRoute: "/",
          ),
          onWillPop: () {
            var pop = true;
            if (ScreenSplash.navigationKey.currentState?.canPop() == true) {
              ScreenSplash.navigationKey.currentState?.pop();
              pop = false;
            }
            return Future<bool>.value(pop);
          },
        ),
      ],
    );
  }
}

class WidgetBackground extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _StateWidgetBackground();
}

class _StateWidgetBackground extends State<WidgetBackground> with LifecycleAware, LifecycleMixin {
  @override
  Widget build(BuildContext context) => Container();

  @override
  void onLifecycleEvent(LifecycleEvent event) {}
}

class SubMain extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _StateSubMain();
}

class _StateSubMain extends State<SubMain> with LifecycleAware, LifecycleMixin {
  @override
  Widget build(BuildContext context) {
    return Material(
        color: Colors.transparent,
        child: TextButton(
          child: const Text("crash"),
          onPressed: () => ScreenSplash.navigationKey.currentState?.pushNamed("crash"),
        ));
  }

  @override
  void onLifecycleEvent(LifecycleEvent event) {}
}

class CrashWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _CrashWidgetState();
}

class _CrashWidgetState extends State<CrashWidget> with LifecycleAware, LifecycleMixin {
  @override
  Widget build(BuildContext context) {
    return const Material(color: Colors.transparent, child: Text("Should not crash here, yet you will not see this"));
  }

  @override
  void onLifecycleEvent(LifecycleEvent event) {}
}

removing this

SizedBox(
          width: double.infinity,
          child: WidgetBackground(),
        ),

fixes the crash.

======== Exception caught by widgets library ======================================================= The following _Exception was thrown building Builder: Exception: Can not get associated LifecycleObserver, did you forget to register it in MaterialApp or Navigator?

0 new LifecycleObserver.internalGet (package:lifecycle/src/lifecycle_observer.dart:34:5)

1 LifecycleMixin.didChangeDependencies (package:lifecycle/src/lifecycle_mixin.dart:40:46)

2 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4914:11)

3 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4729:5)

... Normal element mounting (171 frames)

174 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3790:14)

175 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6422:36)

176 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6433:32)

... Normal element mounting (60 frames)

236 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3790:14)

237 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6422:36)

238 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6433:32)

... Normal element mounting (177 frames)

415 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3790:14)

416 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6422:36)

417 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6433:32)

... Normal element mounting (362 frames)

779 _InheritedProviderScopeElement.mount (package:provider/src/inherited_provider.dart:411:11)

... Normal element mounting (7 frames)

786 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)

... Normal element mounting (7 frames)

793 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3790:14)

794 Element.updateChild (package:flutter/src/widgets/framework.dart:3540:18)

795 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1198:16)

796 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:1167:5)

797 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart:1112:18)

798 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2600:19)

799 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:1111:13)

800 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:944:7)

chenenyu commented 2 years ago

Could you have a try by updating the dependency?

lifecycle:
    git:
      url: https://github.com/chenenyu/lifecycle.git
      ref: f10a0b02bc32e6ee97e5cc09cf1960090724aec8

Waiting for your feedback~ 😄