第一次尝试后热重载卡住

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我正在使用vscode开发flutter应用程序，我不知道发生了什么！当我保存项目并尝试热重载仅一次时，它的工作和热重载（Performing hot reload）的通知保留在 vscode 的底部，下一次热重载不起作用。

Vscode 不会抛出任何错误或其他问题来解决问题，因此我使用run命令运行应用程序，并在热重载后，结果如下：

Flutter run key commands.
r Hot reload. 
R Hot restart.
h Repeat this help message.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).
An Observatory debugger and profiler on sdk gphone x86 arm is available at: http://127.0.0.1:40989/zVisdoiRRE8=/

Flutter DevTools, a Flutter debugger and profiler, on sdk gphone x86 arm is available at: http://127.0.0.1:9101?uri=http%3A%2F%2F127.0.0.1%3A40989%2FzVisdoiRRE8%3D%2F

Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety

Performing hot reload...

现在，当我按 r 时，热重载不起作用。

我正在使用 fvm，这是我的 sdk 版本：

$ flutter doctor -v
[?] Flutter (Channel unknown, 2.0.6, on Linux, locale en_US.UTF-8)
    • Flutter version 2.0.6 at /home/alt/fvm/versions/2.0.6
    • Framework revision 1d9032c7e1 (5 weeks ago), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3

[?] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /mnt/SSDP/Sdk/android/
    • Platform android-S, build-tools 30.0.3
    • ANDROID_HOME = /mnt/SSDP/Sdk/android
    • ANDROID_SDK_ROOT = /mnt/SSDP/Sdk/android/
    • Java binary at: /mnt/SSDP/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[?] Chrome - develop for the web
    • Chrome at google-chrome

[?] Android Studio
    • Android Studio at /mnt/SSDP/android-studio/
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /mnt/SSDP/android-studio/
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[?] VS Code (version 1.56.2)
    • VS Code at /usr/share/code
    • Flutter extension version 3.23.0

[?] Connected device (2 available)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86    • Android 10 (API 29)
      (emulator)
    • Chrome (web)                       • chrome        • web-javascript • Google Chrome
      91.0.4472.77

• No issues found!
  • 我在 Android Studio 中也遇到了这个问题。
以上是第一次尝试后热重载卡住的全部内容。
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