问题描述
我知道很多人问这个问题,但我没有找到任何答案,所以这有点不同
我正面临这个错误。当我直接从主页调用 Desired Screen 时它工作正常,但是当我从另一个屏幕导航 DesiredScreen 时,它显示此错误。我用地图给你解释
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当我这样导航时没问题
MultiProvider -> MaterialApp -> DesiredScreen
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但是当我浏览它时,它显示了这个 BadState 错误
MultiProvider -> MaterialApp -> HomePage -> DesiredScreen
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更新的问题
当我把条件放在主类小部件中时
count == 1 ? DesiredScreen() : HomePage()
它显示此错误,但如果我从其他屏幕导航到 DesiredScreen,它不会显示错误
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代码
Widget build(BuildContext context) {
return MultiProvider(
providers: [
FutureProvider(
create: (_) => locatorService.getLocation(),initialData: null,),FutureProvider(
initialData: null,create: (_) {
ImageConfiguration imageConfiguration =
createLocalImageConfiguration(context);
return BitmapDescriptor.fromAssetimage(
imageConfiguration,'assets/images/fire.png');
},ProxyProvider2<Position,BitmapDescriptor,Future<List<Place>>>(
update: (_,position,icon,places) {
return (position != null)
? placeService.getPlaces(
position.latitude,position.longitude,icon)
: null;
})
],child: MaterialApp(
debugShowCheckedModeBanner: false,theme: ThemeData(
primaryColor: Colors.blueAccent,home: DesiredScreen(),);
错误
════════ Exception caught by widgets library ═══════════════════════════════════
The following StateError was thrown building GoogleMapView(dirty,dependencies: [_InheritedProviderScope<Position>,_InheritedProviderScope<Future<List<Place>>>],state: _GoogleMapViewState#878c8):
Bad state: Tried to read a provider that threw during the creation of its value.
The exception occurred during the creation of type Future<List<Place>>.
The relevant error-causing widget was
GoogleMapView
lib\screens\home.dart:7
When the exception was thrown,this was the stack
#0 _CreateInheritedProviderState.value
package:provider/src/inherited_provider.dart:661
#1 _InheritedProviderScopeElement.value
package:provider/src/inherited_provider.dart:544
#2 Provider.of
package:provider/src/provider.dart:289
#3 _GoogleMapViewState.build
package:vibecheck/screens/google_map_view.dart:39
#4 StatefulElement.build
package:Flutter/…/widgets/framework.dart:4612
...
════════════════════════════════════════════════════════════════════════════════
解决方法
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