我一直在构建 Flutter 应用程序，一切似乎都运行良好，但今天我尝试调用 initState()在 statefulWidget 中，所以我可以进行 API 调用，但它返回一个我不熟悉的错误
我的代码:
class Home extends StatefulWidget {
final String header;
Home({Key key, this.header}): super(key: key);
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home>{
@override
Widget build(BuildContext context) {
Top top;
bool _loading = true;
fetchData() async {
setState(() {
_loading = true;
});
//Fetch top Animes
var res = await http.get(Constants.topAnimes);
var decodedJson = jsonDecode(res.body);
print(decodedJson['top']);
top = Top.fromJson(decodedJson['top']);
print(top.toJson());
setState(() {
_loading = false;
});
}
@override
void initState() {
super.initState();
fetchData();
}
return Container();
}
}
错误:
I/flutter (24395): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/View (24395): Key down dispatch to io.flutter.view.FlutterView{8dd5ba8 VFE...... .F...... 0,0-720,1200}, event = KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F11, scanCode=87, metaState=0, flags=0x8, repeatCount=11805, eventTime=9200503, downTime=8597691, deviceId=2, source=0x101 }
I/flutter (24395): The following assertion was thrown building Home(dirty, state: _HomeState#5567f):
I/flutter (24395): 'package:flutter/src/widgets/framework.dart': Failed assertion: line 1008 pos 12:
I/flutter (24395): '_debugLifecycleState == _StateLifecycle.created': is not true.
I/View (24395): Key down dispatch to io.flutter.view.FlutterView{8dd5ba8 VFE...... .F...... 0,0-720,1200}, event = KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F11, scanCode=87, metaState=0, flags=0x8, repeatCount=11806, eventTime=9200553, downTime=8597691, deviceId=2, source=0x101 }
I/flutter (24395):
I/flutter (24395): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (24395): more information in this error message to help you determine and fix the underlying cause.
I/flutter (24395): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (24395): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (24395):
I/flutter (24395): When the exception was thrown, this was the stack:
I/flutter (24395): #2 State.initState (package:flutter/src/widgets/framework.dart:1008:12)
I/flutter (24395): #3 _HomeState.build.initState (package:flutter_anime/screens/home.dart:66:13)
I/flutter (24395): #4 _HomeState.build (package:flutter_anime/screens/home.dart:70:14)
I/flutter (24395): #5 StatefulElement.build (package:flutter/src/widgets/framework.dart:3825:27)
I/flutter (24395): #6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3736:15)
I/flutter (24395): #7 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #9 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #10 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #11 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #12 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #13 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #14 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #15 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #16 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #17 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #18 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #19 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #20 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #22 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #24 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #25 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #26 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #27 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #28 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #29 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #30 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #31 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #32 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #33 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #35 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #36 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #37 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #38 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #39 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #40 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #41 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #42 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #43 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #44 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #45 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #46 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #47 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #48 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #49 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #50 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #51 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #52 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #53 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #54 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #55 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #56 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #57 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #58 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #59 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #60 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #61 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #62 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #63 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/View (24395): Key down dispatch to io.flutter.view.FlutterView{8dd5ba8 VFE...... .F...... 0,0-720,1200}, event = KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F11, scanCode=87, metaState=0, flags=0x8, repeatCount=11809, eventTime=9200704, downTime=8597691, deviceId=2, source=0x101 }
I/flutter (24395): #64 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #65 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #66 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #67 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #68 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #69 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #70 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #71 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #72 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #73 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #74 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #75 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #76 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #77 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #78 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #79 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #80 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #81 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #82 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #83 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #84 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #85 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #86 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #87 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #88 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #89 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #90 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #91 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #92 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #93 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #94 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #95 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #96 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #97 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #98 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #99 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #100 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #101 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4982:32)
I/flutter (24395): #102 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #103 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #104 _TheatreElement.mount (package:flutter/src/widgets/overlay.dart:494:16)
I/flutter (24395): #105 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #106 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #107 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #108 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #109 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #110 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #111 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #112 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #113 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #114 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #115 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #116 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #117 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #118 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #119 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #120 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #121 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #122 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #123 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #124 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #125 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #126 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #127 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #128 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #129 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #130 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #131 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #132 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #133 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #134 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #135 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #136 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #137 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #138 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #139 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #140 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #141 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #142 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #143 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #144 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #145 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #146 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #147 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #148 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #149 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #150 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #151 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #152 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #153 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #154 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #155 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #156 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #157 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #158 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #159 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #160 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #161 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #162 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #163 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #164 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #165 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #166 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #167 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #168 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #169 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #170 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #171 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #172 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #173 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #174 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #175 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #176 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #177 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #178 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #179 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #180 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #181 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #182 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #183 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #184 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #185 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #186 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #187 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #188 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #189 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #190 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #191 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #192 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #193 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #194 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #195 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #196 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #197 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #198 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #199 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #200 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #201 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #202 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #203 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #204 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4876:14)
I/flutter (24395): #205 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #206 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #207 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #208 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #209 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #210 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #211 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #212 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #213 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #214 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #215 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #216 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #217 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #218 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #219 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #220 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #221 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #222 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #223 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #224 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #225 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #226 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #227 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #228 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #229 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #230 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #231 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #232 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #233 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #234 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #235 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #236 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3864:11)
I/flutter (24395): #237 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #238 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #239 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #240 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3747:16)
I/flutter (24395): #241 Element.rebuild (package:flutter/src/widgets/framework.dart:3559:5)
I/flutter (24395): #242 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3716:5)
I/flutter (24395): #243 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)
I/flutter (24395): #244 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)
I/flutter (24395): #245 Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)
I/flutter (24395): #246 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:933:16)
I/flutter (24395): #247 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:904:5)
I/flutter (24395): #248 RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:850:17)
I/flutter (24395): #249 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2253:19)
I/flutter (24395): #250 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:849:13)
I/flutter (24395): #251 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:736:7)
最佳答案
您的所有状态属性和 initState 方法都在您的构建方法中。将它们移到构建方法之外。此外，变量 _loading 的初始值为真，因此无需在 fetchData 的开头再次将其设置为真。功能。
class Home extends StatefulWidget {
final String header;
Home({Key key, this.header}): super(key: key);
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home>{
Top top;
bool _loading = true;
@override
void initState() {
super.initState();
fetchData();
}
@override
Widget build(BuildContext context) {
if(_loading) {
return CircularProgressIndicator();
}
return Container(
child: Text("LOADED");
);
}
fetchData() async {
//Not needed since it's already set to true.
/*setState(() {
_loading = true;
});*/
//Fetch top Animes
var res = await http.get(Constants.topAnimes);
var decodedJson = jsonDecode(res.body);
print(decodedJson['top']);
top = Top.fromJson(decodedJson['top']);
print(top.toJson());
setState(() {
_loading = false;
});
}
}
关于android - Flutter initState() 返回 _debugLifecycleState 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55701597/