在 IntelliJ IDE 中运行 Dart 示例项目时出错 [重复]

Posted 2023-02-23

【中文标题】在 IntelliJ IDE 中运行 Dart 示例项目时出错 [重复]

【英文标题】：Error while running Dart Sample Project in IntelliJ IDE [duplicate]

【发布时间】：2019-06-17 19:09:06

【问题描述】：

谁能帮我理解问题出在哪里？我无法为以下代码获得所需的输出？ 请检查以下代码和日志

ma​​in.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget 
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  


class MyHomePage extends StatefulWidget 
  MyHomePage(Key key, this.title) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();


class _MyHomePageState extends State<MyHomePage> 
  int _counter = 0;

  void _incrementCounter() 
    setState(() 
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    );
  

  @override
  Widget build(BuildContext context) 
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  

输出

/Users/chandramoulireddyporeddy/Documents/flutter/bin/cache/dart-sdk/bin/dart --enable-asserts --enable-vm-service:61567 /Users/chandramoulireddyporeddy/Documents/Workspace/flutter_app1/lib/主要.dart 天文台收听http://127.0.0.1:61567/

lib/main.dart:1：警告：将其解释为包 URI，'package:flutter_app1/main.dart'。 lib/main.dart:3:8：错误：未找到：'dart:ui' 导入“飞镖：ui”； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/animated_icons.dart:9:8：错误：未找到：'dart:ui' import 'dart:ui' as ui show Paint, Path, Canvas; ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/animated_icons.dart:10:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示 lerpDouble； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/arc.dart:6:8: 错误：未找到：'dart:ui' 导入 'dart:ui' 显示 lerpDouble； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/colors.dart:5:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示颜色； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/dialog.dart:6:8: 错误：未找到：'dart:ui' 导入“飞镖：ui”； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/input_border.dart:6:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示 lerpDouble； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/input_decorator.dart:6:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示 lerpDouble； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/mergeable_material.dart:5:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示 lerpDouble； ^ file:///Users/chandramoulireddyporeddy/Documents/flutter/packages/flutter/lib/src/material/shadows.dart:5:8：错误：未找到：'dart:ui' 导入 'dart:ui' 显示颜色、偏移量； ^

进程以退出代码 254 结束

【参考方案1】：

可能重复 dart:ui:1: Error: Not found: dart:ui. flutter/dart:

运行应用时应该有两种运行配置，运行带有 Flutter 图标的一种

【讨论】：

我只看到一个运行配置。

介意将颤振医生的输出附加到您的问题中吗？

我重启了IDE，问题自动修复了。

在 Android Studio 的顶部，有一个带有目标的下拉菜单。它可能说“main.dart”。在盒子里面，“main.dart”的左边，有一个蓝色的符号。它要么是“[ (F) main.dart ]”（Flutter 标志），要么是 Dart 箭头鳍标志“[ (X) main.dart ]”。它应该是正确构建的“F”版本，所以选择它。

【参考方案2】：

这真的很有帮助，谢谢！我的 2 美分用于提高可读性。

错误：

packages/flutter/lib/src/material/bottom_navigation_bar_theme.dart:5:8: 错误：未找到：'dart:ui'

遵循import 'dart:ui' as ui show Paint, Path, Canvas;import 'dart:ui' show lerpDouble等很多import语句错误；

解决方案： 在 Android Studio 中，在设备下拉列表旁边的目标下拉列表中，请确保选择 Flutter main.dart，而不是 Dart main.dart。可以通过相应的标志来区分这一点。

【讨论】：

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