报错如图

问题代码

import 'package:flutter/material.dart';void main() {runApp(SampleAppPage());
}class SampleAppPage extends StatefulWidget {const SampleAppPage({Key? key}) : super(key: key);@override_SampleAppPageState createState() => _SampleAppPageState();
}class _SampleAppPageState extends State<SampleAppPage>with SingleTickerProviderStateMixin {late AnimationController controller;late CurvedAnimation curve;@overridevoid initState() {super.initState();controller = AnimationController(duration: const Duration(milliseconds: 2000),vsync: this,);curve = CurvedAnimation(parent: controller,curve: Curves.easeIn,);}@overrideWidget build(BuildContext context) {return Scaffold(body: Center(child: GestureDetector(child: RotationTransition(turns: curve,child: const FlutterLogo(size: 200.0),),onDoubleTap: () {if (controller.isCompleted) {controller.reverse();} else {controller.forward();}},),),);}
}

原因： flutter 界面的根组件必须是MaterialApp

修复之后的代码

import 'package:flutter/material.dart';void main() {runApp(SampleApp());
}class SampleApp extends StatelessWidget {// This widget is the root of your application.const SampleApp({Key? key}) : super(key: key);@overrideWidget build(BuildContext context) {return const MaterialApp(title: 'Sample App',home: SampleAppPage(),);}
}class SampleAppPage extends StatefulWidget {const SampleAppPage({Key? key}) : super(key: key);@override_SampleAppPageState createState() => _SampleAppPageState();
}class _SampleAppPageState extends State<SampleAppPage>with SingleTickerProviderStateMixin {late AnimationController controller;late CurvedAnimation curve;@overridevoid initState() {super.initState();controller = AnimationController(duration: const Duration(milliseconds: 2000),vsync: this,);curve = CurvedAnimation(parent: controller,curve: Curves.easeIn,);}@overrideWidget build(BuildContext context) {return Scaffold(body: Center(child: GestureDetector(child: RotationTransition(turns: curve,child: const FlutterLogo(size: 200.0),),onDoubleTap: () {if (controller.isCompleted) {controller.reverse();} else {controller.forward();}},),),);}
}

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flutter 报错 No MediaQuery widget ancestor found.

报错如图

原因： flutter 界面的根组件必须是MaterialApp

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