FlutterのWindous上の環境構築時のエラー対応方法 - Pythonによるデータ分析・機械学習ブログ

C:\Users\uytat>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [Version 10.0.22000.675], locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Chrome - develop for the web
[X] Visual Studio - develop for Windows
    X 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 (version 2021.2)
[√] VS Code (version 1.67.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

! Doctor found issues in 2 categories.

Android Toolchanのライセンスの同意

次に、コマンドプロンプトで

flutter doctor --android-licenses

を実行して、ライセンスを確認・同意をしていきます。

それが終わったら、ここで再度、flutter doctorをコマンドプロンプトで実行して環境の確認を行います。これでAndroid Studio関連のインストールは完了です。

次はVisual Studioに対応していきます。

C:\Users\uytat>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [Version 10.0.22000.675], locale ja-JP)
[√] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[√] Chrome - develop for the web
[X] Visual Studio - develop for Windows
    X 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 (version 2021.2)
[√] VS Code (version 1.67.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

Visual Studio Community 2022のインストール

こちらの記事を参考にさせていただきて、進めました。

qiita.com

以下の公式サイトからVisual Studio Community 2022をインストールします。

visualstudio.microsoft.com

VisualStudioSetup.exeをダブルクリックして、インストールを開始してください。途中で、必要なコンポーネントのインストールの選択を求められますので、「C++によるデスクトップ開発」を選択して「インストールボタン」をクリックして、インストールを開始します。その後、インストールが始まり、そこそこ時間がかかります。完了したら、Visual Studio Community 2022を起動してMicrosoftアカウントでログインしてください。

改めて、ここでflutter doctorをコマンドプロンプトで実行して環境の確認を行います。

なにやら、Visual Studioの部分でドクロのマークが出ています。

C:\Users\uytat>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [Version 10.0.22000.675], locale ja-JP)
[√] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[√] Chrome - develop for the web
[☠] Visual Studio - develop for Windows (the doctor check crashed)
    X Due to an error, the doctor check did not complete. If the error message below is not helpful, please let us know
      about this issue at https://github.com/flutter/flutter/issues.
    X Exception: Bad UTF-8 encoding (U+FFFD; REPLACEMENT CHARACTER) found while decoding string: [
        {
          "instanceId": "c2d63e43",
          "installDate": "2022-05-29T06:15:12Z",
          "installationName": "VisualStudio/17.2.2+32519.379",
          "installationPath": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community",
          "installationVersion": "17.2.32519.379",
          "productId": "Microsoft.VisualStudio.Product.Community",
          "productPath": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\devenv.exe",
          "state": 4294967295,
          "isComplete": true,
          "isLaunchable": true,
          "isPrerelease": false,
          "isRebootRequired": false,
          "displayName": "Visual Studio Community 2022",
          "description": " w   A I [ v   \ [ X ̋    쐬 ҁA 
          "channelId": "VisualStudio.17.Release",
          "channelUri": "https://aka.ms/vs/17/release/channel",
          "enginePath": "C:\\Program Files (x86)\\Microsoft Visual
          Studio\\Installer\\resources\\app\\ServiceHub\\Services\\Microsoft.VisualStudio.Setup.Service",
          "installedChannelUri": "https://aka.ms/vs/17/release/channel",
          "releaseNotes": "https://docs.microsoft.com/en-us/visualstudio/releases/2022/release-notes-v17.2#17.2.2",
          "thirdPartyNotices": "https://go.microsoft.com/fwlink/?LinkId=661288",
          "updateDate": "2022-05-29T06:15:12.9695389Z",
          "catalog": {
            "buildBranch": "d17.2",
            "buildVersion": "17.2.32519.379",
            "id": "VisualStudio/17.2.2+32519.379",
            "localBuild": "build-lab",
            "manifestName": "VisualStudio",
            "manifestType": "installer",
            "productDisplayVersion": "17.2.2",
            "productLine": "Dev17",
            "productLineVersion": "2022",
            "productMilestone": "RTW",
            "productMilestoneIsPreRelease": "False",
            "productName": "Visual Studio",
            "productPatchVersion": "2",
            "productPreReleaseMilestoneSuffix": "1.0",
            "productSemanticVersion": "17.2.2+32519.379",
            "requiredEngineVersion": "3.2.2148.26540"
          },
          "properties": {
            "campaignId": "2030:d2469fca-9bdd-4b53-b2b9-0927e45b6669",
            "channelManifestId": "VisualStudio.17.Release/17.2.2+32519.379",
            "nickname": "",
            "setupEngineFilePath": "C:\\Program Files (x86)\\Microsoft Visual Studio\\Installer\\setup.exe"
          }
        }
      ]
      . The Flutter team would greatly appreciate if you could file a bug explaining exactly what you were doing when
      this happened:
      https://github.com/flutter/flutter/issues/new/choose
      The source bytes were:
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[√] Android Studio (version 2021.2)
[√] VS Code (version 1.67.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

! Doctor found issues in 1 category.

こちらの対処方法は、以下の記事を参考に進めました。

qiita.com

以下のリンクのvswhere.exeのバグが原因とのことでした。

C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe

そこで、以下のリンクから最新のvswhere.exeをインストールして、上記フォルダのファイルを置き換えました。

github.com

ここで再度、flutter doctorをコマンドプロンプトで実行して環境の確認を行います。

これですべての問題が解決しました。やっとFlutterで開発できる・・・。

C:\Users\uytat>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [Version 10.0.22000.675], locale ja-JP)
[√] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.2.2)
[√] Android Studio (version 2021.2)
[√] VS Code (version 1.67.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

• No issues found!

おわりに

本記事ではFlutterの環境構築時に出現したエラー内容とその対応方法を記載しました。皆様の開発がスムーズに行くよう、役立てば幸いです。