下午好，我在尝试调用Navigator.of（上下文）.pushReplacement时遇到麻烦，我返回了以下错误：
2019-07-07 16:18:17.821 26413-26474/com.zotinfo.diskhamburguerapp E/zygote64: The String#value field is not present on Android versions >= 6.0
2019-07-07 16:18:18.495 26413-26442/com.zotinfo.diskhamburguerapp E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Looking up a deactivated widget's ancestor is unsafe.
At this point the state of the widget's element tree is no longer stable. To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.
#0 Element._debugCheckStateIsActiveForAncestorLookup.<anonymous closure> (package:flutter/src/widgets/framework.dart:3257:9)
#1 Element._debugCheckStateIsActiveForAncestorLookup (package:flutter/src/widgets/framework.dart:3266:6)
#2 Element.ancestorStateOfType (package:flutter/src/widgets/framework.dart:3314:12)
#3 Navigator.of (package:flutter/src/widgets/navigator.dart:1446:19)
#4 Navigator.pushReplacement (package:flutter/src/widgets/navigator.dart:1125:22)
#5 _ConfereCadastroState.build.<anonymous closure> (package:diskhamburguerapp/widgets/confere_cadastro.dart:61:21)
#6 _rootRunUnary (dart:async/zone.dart:1132:38)
#7 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#8 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#9 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#10 _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#11 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:707:11)
#12 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:667:7)
#13 _rootRun (dart:async/zone.dart:1120:38)
#14 _CustomZone.run (dart:async/zone.dart:1021:19)
#15 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#16 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#17 _rootRun (dart:async/zone.dart:1124:13)
#18 _CustomZone.run (dart:async/zone.dart:1021:19)
#19 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#20 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#21 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#22 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
这是我的Navigator调用代码
@override
Widget build(BuildContext context) {
_loginBloc.outState.listen((state){
switch(state){
case UserState.SUCCESS:
Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => HomeScreen()));
break;
case UserState.FAIL:
Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => NewLoginScreen()));
break;
case UserState.NOT_ADMIN:
break;
case UserState.LOADING:
case UserState.IDLE:
Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => CadastroScreen()));
break;
}
});
return Scaffold(
//key: _scaffoldKey,
backgroundColor: Theme.of(context).primaryColor,
body: StreamBuilder<UserState>(
stream: _loginBloc.outState,
initialData: UserState.LOADING,
builder: (context, snapshot) {
此错误不会使应用崩溃，也不会发生任何事情，它可以调用路线的屏幕，显示一切正常，但是我担心这是一个错误，它可能会损害其他手机上应用的运行。
我在所有情况下都进行了搜索，包括google，stackoverflow，但是没有任何可能的技巧可以解决此问题，如果遇到过此问题的人有解决方案，我将非常感激。