flutterのインストール時にエラーが出たときの解決手順

IT

flutterのインストール後、環境チェックのflutter doctorを実行した際に、以下のメッセージが表示されたときの解決方法

  • cmdline-tools component is missing
  • Flutter requires Android SDK 29 and the Android BuildTools 28.0.3
  • Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses

手順

flutterのインストール後、　flutter doctorを実行すると、以下となった

PS C:\src\flutter> flutter doctor

  ╔════════════════════════════════════════════════════════════════════════════╗
  ║                 Welcome to Flutter! - https://flutter.dev                  ║
  ║                                                                            ║
  ║ The Flutter tool uses Google Analytics to anonymously report feature usage ║
  ║ statistics and basic crash reports. This data is used to help improve      ║
  ║ Flutter tools over time.                                                   ║
  ║                                                                            ║
  ║ Flutter tool analytics are not sent on the very first run. To disable      ║
  ║ reporting, type 'flutter config --no-analytics'. To display the current    ║
  ║ setting, type 'flutter config'. If you opt out of analytics, an opt-out    ║
  ║ event will be sent, and then no further information will be sent by the    ║
  ║ Flutter tool.                                                              ║
  ║                                                                            ║
  ║ By downloading the Flutter SDK, you agree to the Google Terms of Service.  ║
  ║ Note: The Google Privacy Policy describes how data is handled in this      ║
  ║ service.                                                                   ║
  ║                                                                            ║
  ║ Moreover, Flutter includes the Dart SDK, which may send usage metrics and  ║
  ║ crash reports to Google.                                                   ║
  ║                                                                            ║
  ║ Read about data we send with crash reports:                                ║
  ║ https://flutter.dev/docs/reference/crash-reporting                         ║
  ║                                                                            ║
  ║ See Google's privacy policy:                                               ║
  ║ https://policies.google.com/privacy                                        ║
  ╚════════════════════════════════════════════════════════════════════════════╝


Running "flutter pub get" in flutter_tools...                       8.8s
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.19044.1645], locale ja-JP)
[✗] Android toolchain - develop for Android devices
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
[✓] Chrome - develop for the web
[✗] Visual Studio - develop for Windows
    ✗ Visual Studio not installed; this is necessary for Windows development.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components
[!] Android Studio (not installed)
[✓] VS Code
[✓] VS Code, 64-bit edition (version 1.66.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

! Doctor found issues in 3 categories.

インストールされていないAndroid StudioとVisual Studioの最新版をインストールして再実行したところ、以下のエラーが残った

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.

cmdline-tools componentがないようなので追加する

Android Studioを起動する

More Actionを選択する

SDK Managerを選択する

Appearance & Behavior → System Settings → Android SDK → SDK Tools の一覧から、Android SDK Command-line Tools (latest)にチェックを付けてOKを押すと、追加インストールされる。 flutter doctorを再実行すると、以下のエラーとなった

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ✗ Flutter requires Android SDK 29 and the Android BuildTools 28.0.3
      To update the Android SDK visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed
      instructions.
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

SDK 29が要求されたので、Android StudioのSDK Managerから、同様にインストールする。 SDK 29の数字はAPI Levelなので、Android 10.0を選択する。

[!] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

については、flutter doctor --android-licensesを実行し、すべてAccept? (y/N): yと入力する。
すべてのエラーがなくなった。

PS C:\src\flutter> flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.19044.1645], locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
[✓] Chrome - develop for the web
[✓] Visual Studio - develop for Windows (Visual Studio Community 2022 17.1.6)
[✓] Android Studio (version 2021.1)
[✓] VS Code
[✓] VS Code, 64-bit edition (version 1.66.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

• No issues found!