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error occured Navigator.pushNamed(context, '/') in initState() of State class #93

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shyandsy opened this issue Dec 25, 2018 · 4 comments
Closed

error occured Navigator.pushNamed(context, '/') in initState() of State class #93

shyandsy opened this issue Dec 25, 2018 · 4 comments

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@shyandsy
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shyandsy commented Dec 25, 2018 •
edited
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I was trying to do login state check when user jump to login page.

In the initState method, I checked the login state and jumped back to home if the use has logged in.
but the error occured when I try to use navigator method in initState()

"I/flutter ( 4757): setState() or markNeedsBuild() called during build."

class _LoginPageState extends State<LoginPage> with SingleTickerProviderStateMixin{
  Animation animation, delayedAnimation, muchDelayedAnimation;
  AnimationController animationController;

  String username = "";
  String password = "";
  String message = "";

  final usernameController = TextEditingController();
  final passwordController = TextEditingController();

  @override
  void initState(){
    super.initState();
    
    /*  
    error oocured here, program will run fine when:
          a. I put this statement into onPress() of a button control 
          or
          b. remove this statement
   */
    Navigator.pushNamed(context, '/');
  }

error information

Restarted application in 2,193ms.
I/flutter ( 4757): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 4757): The following assertion was thrown building Builder:
I/flutter ( 4757): setState() or markNeedsBuild() called during build.
I/flutter ( 4757): This Overlay widget cannot be marked as needing to build because the framework is already in the
I/flutter ( 4757): process of building widgets. A widget can be marked as needing to be built during the build phase
I/flutter ( 4757): only if one of its ancestors is currently building. This exception is allowed because the framework
I/flutter ( 4757): builds parent widgets before children, which means a dirty descendant will always be built.
I/flutter ( 4757): Otherwise, the framework might not visit this widget during this build phase.
I/flutter ( 4757): The widget on which setState() or markNeedsBuild() was called was:
I/flutter ( 4757):   Overlay-[LabeledGlobalKey<OverlayState>#dd7af](state: OverlayState#697dd(entries:
I/flutter ( 4757):   [OverlayEntry#e8a6b(opaque: false; maintainState: false), OverlayEntry#a23fc(opaque: false;
I/flutter ( 4757):   maintainState: true), OverlayEntry#1e1ac(opaque: false; maintainState: false),
I/flutter ( 4757):   OverlayEntry#9e10f(opaque: false; maintainState: true), OverlayEntry#c0047(opaque: false;
I/flutter ( 4757):   maintainState: false), OverlayEntry#87a57(opaque: false; maintainState: true)]))
I/flutter ( 4757): The widget which was currently being built when the offending call was made was:
I/flutter ( 4757):   Builder
I/flutter ( 4757):
I/flutter ( 4757): When the exception was thrown, this was the stack:
I/flutter ( 4757): #0      Element.markNeedsBuild.<anonymous closure> (package:flutter/src/widgets/framework.dart:3485:11)
I/flutter ( 4757): #1      Element.markNeedsBuild (package:flutter/src/widgets/framework.dart:3511:6)
I/flutter ( 4757): #2      State.setState (package:flutter/src/widgets/framework.dart:1146:14)
I/flutter ( 4757): #3      OverlayState.insertAll (package:flutter/src/widgets/overlay.dart:301:5)
I/flutter ( 4757): #4      OverlayRoute.install (package:flutter/src/widgets/routes.dart:43:24)
I/flutter ( 4757): #5      TransitionRoute.install (package:flutter/src/widgets/routes.dart:185:11)
I/flutter ( 4757): #6      ModalRoute.install (package:flutter/src/widgets/routes.dart:861:11)
I/flutter ( 4757): #7      NavigatorState.push (package:flutter/src/widgets/navigator.dart:1560:11)
I/flutter ( 4757): #8      NavigatorState.pushNamed (package:flutter/src/widgets/navigator.dart:1473:12)
I/flutter ( 4757): #9      Navigator.pushNamed (package:flutter/src/widgets/navigator.dart:740:34)
I/flutter ( 4757): #10     _LoginPageState.initState (package:shadowsock/page/login.dart:33:15)
I/flutter ( 4757): #11     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3830:58)
I/flutter ( 4757): #12     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #13     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #14     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #15     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #16     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #17     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #18     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #19     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #20     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #21     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #22     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #23     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #24     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #25     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #26     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #27     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #28     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #29     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #30     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #31     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #32     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #33     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #34     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #35     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #36     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #37     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #38     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #39     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
I/flutter ( 4757): #40     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #41     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #42     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #43     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #44     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #45     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #46     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #47     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #48     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #49     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #50     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #51     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #52     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
I/flutter ( 4757): #53     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #54     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #55     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #56     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #57     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #58     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #59     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #60     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #61     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #62     ComponentElement.mount (package:flutter/src/widgets/framework.dart
I/flutter ( 4757): #63     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #64     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #65     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #66     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #67     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #68     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #69     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #70     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #71     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
I/flutter ( 4757): #72     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #73     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #74     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #75     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #76     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #77     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #78     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #79     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #80     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #81     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
I/flutter ( 4757): #82     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #83     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #84     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #85     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #86     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #87     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #88     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #89     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #90     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #91     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #92     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #93     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
I/flutter ( 4757): #94     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #95     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #96     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #97     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #98     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #99     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
I/flutter ( 4757): #100    StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
I/flutter ( 4757): #101    ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
I/flutter ( 4757): #102    Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
I/flutter ( 4757): #103    Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
I/flutter ( 4757): #104    RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:4643:32)
I/flutter ( 4757): #105    MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4975:17)
I/flutter ( 4757): #106    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #107    _TheatreElement.update (package:flutter/src/widgets/overlay.dart:507:16)
I/flutter ( 4757): #108    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #109    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #110    Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #111    StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 4757): #112    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #113    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #114    Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #115    ProxyElement.update (package:flutter/src/widgets/framework.dart:3990:5)
I/flutter ( 4757): #116    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #117    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 4757): #118    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #119    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #120    Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #121    StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 4757): #122    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #123    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 4757): #124    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #125    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 4757): #126    Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 4757): #127    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 4757): #128    Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 4757): #129    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2286:33)
I/flutter ( 4757): #130    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:676:20)
I/flutter ( 4757): #131    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
I/flutter ( 4757): #132    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter ( 4757): #133    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter ( 4757): #134    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:842:5)
I/flutter ( 4757): #135    _invoke (dart:ui/hooks.dart:154:13)
I/flutter ( 4757): #136    _drawFrame (dart:ui/hooks.dart:143:3)
I/flutter ( 4757): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 4757): Another exception was thrown: NoSuchMethodError: The getter 'status' was called on null.
I/flutter ( 4757): Another exception was thrown: NoSuchMethodError: The method 'drive' was called on null.
@brianegan
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brianegan commented Jan 7, 2019 •
edited
Loading

Hey there -- sorry about the delay, was on vacay for a bit. Unfortunately, you cannot directly push to the navigator during initState from any Flutter component.

Two solutions:

  1. Do not push a new route in initState, but push in a callback after a successful login attempt
  2. If you need to push in initState, you must wrap the call in a scheduleMicrotask or a Future.delay type of call. This will then run the initState asynchronously, AFTER the build has completed.

Hope that helps!

@Rajakalla
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Hi ,
I also facing the same issue. But i didnot used the Navigator in initState , I used it on the button press. But same error is coming for me. Need help for this. Hope for your quick response.

RaisedButton(
child: Text("Login"),
onPressed: loginviewmodel.value== null || loginviewmodel.value== '' ? loginviewmodel.login() : loginviewmodel.navigateToPage(context),

@brianegan
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brianegan commented Feb 10, 2019 •
edited
Loading

Hey all: it looks like you're attempting to Navigate while Flutter is building the Widget tree, which isn't allowed.

@shyandsy -- Please do not call Navigator.of directly in the initState method. You must wrap that in a scheduleMicrotask callback so the code runs asynchronously AFTER the Widgets are built.

@Rajakalla You've actually got a small syntax error which is causing your app to navigate during the build. The code should look like this:

// Note how I'm providing a FUNCTION to `onPressed`
onPressed: () => loginviewmodel.value== null || loginviewmodel.value== '' ? loginviewmodel.login() : loginviewmodel.navigateToPage(context),

@Rajakalla
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Thank you @brianegan it worked with flutter redux navigation

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@brianegan @shyandsy @Rajakalla