Flutter dart调试器断点停止工作

我正在学习Dart和Flutter并在Android Studio 3.1.2下开发一个小型Android Flutter应用程序 . 突然调试器断点停止工作 - 在调试模式下启动的应用程序永远不会在它们上停止，并且指示断点的红点变为带有x内部的红点 . 我的应用程序中唯一仍然可以工作的地方是main.dart模块 .

我多次清理项目，在两个不同的设备上测试，完全卸载我的Flutter调试应用程序并开始新的 - 没有任何帮助 . beta（当前beta 2） Channels 上的颤动更新无效 . 还尝试切换到开发和主通道 - 没有帮助 .

有没有人遇到类似的情况，如何应对呢？

编辑，添加flutter doctor的mail.dart和输出（当前在master分支上，但在切换到beta或dev分支后有相同的问题）：

从main.dart导入，或更好的main.dart：

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';

import 'app_strings.dart';
import 'net_libs_page/net_libs_page.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: [
        // ... app-specific localization delegate[s] here
        AppLocalizationsDelegate(),
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        //FallbackMaterialLocalisationsDelegate(),
      ],
      supportedLocales: [
        Locale('en', 'US'), // English
        Locale('es', 'ES'), // Spanish
        Locale('pl', 'PL'),
        // ... other locales the app supports
      ],
      title: '@Voice Network Library', //_strings.title,
      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 press Run > Flutter Hot Reload in IntelliJ). Notice that the
        // counter didn't reset back to zero; the application is not restarted.
        primarySwatch: Colors.indigo,
      ),
      home: NetLibsPage(),
    );
  }
}

颤动的医生输出：

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v0.4.5-pre.52, on Microsoft Windows [Version 10.0.16299.431], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[√] Android Studio (version 3.1)
[!] IntelliJ IDEA Ultimate Edition (version 2018.1)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[!] VS Code, 32-bit edition (version 1.19.3)
[√] Connected devices (1 available)

! Doctor found issues in 2 categories.