Flutter 应用在​​ Android Studio 下运行时死机

Posted 2023-02-23

【中文标题】Flutter 应用在​​ Android Studio 下运行时死机

【英文标题】：Flutter app freezes when running under Android Studio

【发布时间】：2020-09-07 23:11:46

【问题描述】：

我的颤振应用程序有一些繁重的模型初始化。所以它是在异步函数中创建的。这个函数产生的未来被传递给一个小部件。模型加载时 - 我想显示进度指示器。问题是当我从 android Studio 启动我的应用程序时 - 进度指示器冻结并且应用程序从不显示任何其他内容！值得一提的是，有时它会起作用。但说实话很少见。

这可以在 android 模拟器和真实设备上重现。如果从设备本身启动，它永远不会冻结。如果从 Android Studio 以调试模式启动，它也永远不会冻结。

我已经创建了一个最小的复制样本：

import 'package:flutter/material.dart';

Future<int> getTheAnswer() async 
  // To emulate long running method
  await Future.delayed(Duration(seconds: 10));
  return 42;


void main() 
  WidgetsFlutterBinding.ensureInitialized();
  var theAnswer = getTheAnswer();
  // This is just to show that the future was indeed completed
  theAnswer.then((value) => print("Future completed with $value"));
  runApp(MyApp(theAnswer));


class MyApp extends StatelessWidget 
  final Future<int> _myFuture;

  MyApp(this._myFuture);

  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
          body: Center(
              child: FutureBuilder<int>(
        future: _myFuture,
        builder: (context, snapshot) 
          if (!snapshot.hasData) 
            print("No data");
            return CircularProgressIndicator();
          

          // This part is not executed
          print("Has data");
          return Text(
              "The Answer to the Ultimate Question of Life, the Universe, and Everything is $snapshot.data");
        ,
      ))),
    );
  

这个输出：

Launching lib\main.dart on SM G960F in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...                 5.4s
Waiting for SM G960F to report its views...
Debug service listening on ws://127.0.0.1:54422/RHSBDMQJZjA=/ws
Syncing files to device SM G960F...
I/flutter (12538): No data
I/flutter (12538): Future completed with 42

还有flutter doctor -v：

[√] Flutter (Channel master, 1.19.0-2.0.pre.133, on Microsoft Windows [Version 10.0.19041.208], locale en-US)
    • Flutter version 1.19.0-2.0.pre.133 at C:\Repos\flutter
    • Framework revision e92afc16b6 (13 hours ago), 2020-05-21 05:29:01 +0900
    • Engine revision 2d4e83921d
    • Dart version 2.9.0 (build 2.9.0-9.0.dev 40f7a11d89)


[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at C:\Users\am580\AppData\Local\Android\sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
    • All Android licenses accepted.

[√] Android Studio (version 3.5)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] IntelliJ IDEA Community Edition (version 2019.3)
    • IntelliJ at C:\Users\am580\AppData\Local\JetBrains\Toolbox\apps\IDEA-C\ch-0\193.6911.18
    • Flutter plugin version 45.0.2
    • Dart plugin version 193.6911.31

[√] Connected device (2 available)
    • SM G960F                  • 21f9139c290c7ece • android-arm64 • Android 10 (API 29)
    • Android SDK built for x86 • emulator-5554    • android-x86   • Android 10 (API 29) (emulator)

• No issues found!

【参考方案1】：

切换到稳定频道后问题消失：

flutter channel stable

但是它破坏了 android 编译。修复它：

rm android/settings.gradle
flutter create .