Flutterのインストール
❯ brew install --cask flutter
Homebrew経由でインストールしてるので自動的にpathが通ってるはずです
❯ flutter --version
Flutter 3.24.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 2663184aa7 (3 weeks ago) • 2024-09-11 16:27:48 -0500
Engine • revision 36335019a8
Tools • Dart 3.5.3 • DevTools 2.37.3
環境診断ツール ( flutter doctor ) を実行する
❯ flutter doctor
上記コマンドを実行した結果、以下が出力されました
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 14.2 23C64 darwin-arm64, locale ja-JP)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[✗] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS and macOS development.
Download at: https://developer.apple.com/xcode/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
✗ CocoaPods not installed.
CocoaPods is a package manager for iOS or macOS platform code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
For installation instructions, see https://guides.cocoapods.org/using/getting-started.html#installation
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] VS Code (version 1.93.1)
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 3 categories.
現時点での環境構築において完了しているものが [✓] で出力され、足りてないものが [✗] もしくは [!] として出力されます
ということで flutter doctor の出力結果をもとに、それぞれ対応していきます
Android toolchain - develop for Android devices
以下の対応ですね
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
flutter doctor で出力されている通り、私の場合は Android Studio をそもそもインストールできてなかったのでインストールします
[!] Android Studio (not installed)
- Android Studio のインストール
- More Actions > SDK Manager を開く
- Android SDK Command-line Tools (latest) にチェックを入れて Apply をクリック
- 上記ダウンロードが完了したら OK をクリック
改めて flutter doctor を実行します
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 14.2 23C64 darwin-arm64, locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✗] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS and macOS development.
Download at: https://developer.apple.com/xcode/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
✗ CocoaPods not installed.
CocoaPods is a package manager for iOS or macOS platform code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
For installation instructions, see https://guides.cocoapods.org/using/getting-started.html#installation
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.1)
[✓] VS Code (version 1.93.1)
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 2 categories.
別のエラーメッセージが表示されていますね
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
Some Android licenses not accepted.
To resolve this, run: flutter doctor --android-licenses と言われているので従います。
何度か質問されるので全て y を入力します
All SDK package licenses accepted
エラーが解消されましたね
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 14.2 23C64 darwin-arm64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[✗] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS and macOS development.
Download at: https://developer.apple.com/xcode/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
✗ CocoaPods not installed.
CocoaPods is a package manager for iOS or macOS platform code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
For installation instructions, see https://guides.cocoapods.org/using/getting-started.html#installation
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.1)
[✓] VS Code (version 1.93.1)
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 1 category.
次に進みますよ
Xcode installation is incomplete; a full installation is necessary for iOS
以下の対応です
[✗] Xcode - develop for iOS and macOS
✗ Xcode installation is incomplete; a full installation is necessary for iOS and macOS development.
Download at: https://developer.apple.com/xcode/
Or install Xcode via the App Store.
私は Xcode をインストールしておらず、それが原因ですのでインストールしていきます
私の場合は Appleの開発者向けサイト からダウンロードしました
ダウンロード完了後、flutter doctor で出力されている通り以下のコマンドを実行
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
該当のエラーメッセージは消えましたね
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 14.7 23H124 darwin-arm64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[!] Xcode - develop for iOS and macOS (Xcode 16.0)
✗ CocoaPods not installed.
CocoaPods is a package manager for iOS or macOS platform code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
For installation instructions, see https://guides.cocoapods.org/using/getting-started.html#installation
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.1)
[✓] VS Code (version 1.93.1)
[✓] Connected device (3 available)
[✓] Network resources
! Doctor found issues in 1 category.
残るエラーメッセージはラスト1つですね
CocoaPods not installed.
今回は CocoaPods を Homebrew 経由でインストールします
❯ brew install cocoapods
これで flutter doctor が通りましたね！
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 14.7 23H124 darwin-arm64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.1)
[✓] VS Code (version 1.93.1)
[✓] Connected device (3 available)
[✓] Network resources
• No issues found!
No issues found! になりました
Flutter でのアプリ開発を進めていきましょう🎉