当我尝试运行我的 Flutter 程序时，它会卡在“Running Gradle task 'assembleDebug”

Question

每当我尝试在模拟器或真实设备上运行时，它都会卡在“Running Gradle task 'assembleDebug”，整个计算机就会死机并卡住，唯一的出路就是硬重启。

我使用的是华硕笔记本电脑（Windows 10），内存为 16GB。

flutter --version 给出：（当我尝试flutter upgrade 时，它给出相同的结果并说我有最新版本）

Flutter 1.20.0-1.0.pre.42 • channel master • https://github.com/flutter/flutter.git
Framework • revision 401690a64f (2 days ago) • 2020-06-12 19:45:48 -0700
Engine • revision 965fbbed17
Tools • Dart 2.9.0 (build 2.9.0-14.0.dev 2b917f5b6a)

当我运行 flutter doctor 时，我在终端中得到以下输出：UPDATED

   C:\Users\Lidor>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, 1.20.0-1.0.pre.42, on Microsoft Windows [Version 10.0.18362.900], locale en-US)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Android Studio (version 4.0)
[√] IntelliJ IDEA Community Edition (version 2019.2)
[!] Connected device
    ! No devices available

! Doctor found issues in 1 category.

当我运行 flutter doctor -v 时，我得到这个输出：

C:\Users\Lidor>flutter doctor -v
[√] Flutter (Channel master, 1.20.0-1.0.pre.42, on Microsoft Windows [Version 10.0.18362.900], locale en-US)
    • Flutter version 1.20.0-1.0.pre.42 at D:\Study\P.Languages\Flutter\flutter_windows_v1.7.8+hotfix.4-stable\flutter
    • Framework revision 401690a64f (2 days ago), 2020-06-12 19:45:48 -0700
    • Engine revision 965fbbed17
    • Dart version 2.9.0 (build 2.9.0-14.0.dev 2b917f5b6a)

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at D:\Lidor\AppData\Local\Android\sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit
      https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions.

[√] Android Studio (version 4.0)
    • Android Studio at D:\Program Files\Android\Android Studio
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] IntelliJ IDEA Community Edition (version 2019.2)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.2
    • Flutter plugin version 38.1.4
    • Dart plugin version 192.5728.98

[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

我还尝试运行flutter channel master，因为它建议here 以及所有here

Answer 1

发生这种情况的原因有很多：不接受 android-licenses、sdk/flutter 版本不兼容、Windows 防火墙等。

如果你还没有尝试过：

用

更新了文件 android/app/build.gradle

compileSdkVersion 29

运行： flutter clean

否则检查Flutter App stuck at "Running Gradle task 'assembleDebug'... "

或者如果你的Android license status unknown.

Android Studio installs without sdkmanager 取消选中 Hide Obsolete Packages，您将看到 Android SDK Tools (Obsolete) 26.1.1。 然后flutter doctor --android-licenses