class _MyHomePageState extends State<MyHomePage>
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(
title: Text("Main page"),
backgroundColor: Colors.black,
),
body: Center(
child: Column(
children: [
Text(
'this is main page',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 50,
),
),
RaisedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) {
return TestPage();
}),
);
},
child: Text('go to test page'),
),
],
),
),
),
);
}
}
导航器不会给出错误，但它不会转到另一个页面，只是在控制台中给出了很多
======== Exception caught by gesture
The following assertion was thrown while handling a gesture:
Navigator operation requested with a context that does not include a Navigator.
The context used to push or pop routes from the Navigator must be that of a widget that is a descendant of a Navigator widget.
When the exception was thrown, this was the stack:
#0 Navigator.of.<anonymous closure> (package:flutter/src/widgets/navigator.dart:2741:9)
#1 Navigator.of (package:flutter/src/widgets/navigator.dart:2748:6)
#2 Navigator.push (package:flutter/src/widgets/navigator.dart:2137:22)
#3 _MyHomePageState.build.<anonymous closure> (package:navigator_push_route/main.dart:43:29)
#4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)
#6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#8 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
#9 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:558:9)
#10 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
#11 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:139:9)
#12 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:400:8)
#13 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
#14 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
#15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:440:19)
#16 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
#17 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:278:11)
#18 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#19 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#20 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#21 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#25 _invoke1 (dart:ui/hooks.dart:185:10)
#26 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:293:7)
#27 _dispatchPointerDataPacket (dart:ui/hooks.dart:98:31)
(elided 3 frames from dart:async)
Handler: "onTap"
Recognizer: TapGestureRecognizer#b9e3b
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(194.0, 253.0)
finalLocalPosition: Offset(66.0, 24.0)
button: 1
sent tap down
您使用了错误的上下文。
将你的RaisedButton移动到另一个有新上下文的页面，或者用这样的生成器包装它：
Builder(
builder: (context) {
return RaisedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) {
return TestPage();
}),
);
},
child: Text('go to test page'),
);
}
),
这应该工作
在父窗口小部件上分离MaterialApp。
void main() {
runApp(
const MaterialApp(
home: MyHomePage(),
),
);
}
或者为上下文创建一个小部件，
void main() {
runApp(
const MyApp(),
);
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}