====== Flutterインストール時にはまったこと ======
===== 条件 =====
  * 2.10.0をインストール

==== flutter doctorでチェックエラー ====
[[https://docs.flutter.dev/get-started/install/windows|Flutter SDKのZip]]をダウンロードし、展開後、コマンドラインでflutter doctorを実行するとツール類がそろっているかチェックしてくれるのですが怒られました。\\
①Androidのコマンドラインツールがないといわれています。Android Studioは入れてあったんですが。\\  
②Visual Studioもないといわれてますね。 \\ 

<code>
>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.22000.434], locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    ✗ 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.
[✓] 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 (version 2021.1)
[✓] VS Code (version 1.63.2)
[✓] VS Code, 64-bit edition (version 1.26.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

! Doctor found issues in 2 categories.
</code>

===== Flutterで使用するAndroid SDKのコマンドラインツールを導入する =====

①は以下の方法で対応してみました。\\

  - Android Studioを起動し、Tools→SDK ManagerでSDK Managerを開く。
  - 左のツリーからAppearance & Behavior - System Settings - AndroidSDKを選ぶ。
  - SDK Toolsタブを開く。
  - Android SDK Command-line Tools(latest)にチェックを入れ、OKボタンを押す。

{{:fluttererror1.png?600|}}

flutter doctorを再度実施。\\

<code>
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.22000.434], locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[✓] 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 (version 2021.1)
[✓] VS Code (version 1.63.2)
[✓] VS Code, 64-bit edition (version 1.26.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

! Doctor found issues in 2 categories.
</code>

今度はライセンス同意していないといわれました。言われたとおりにflutter doctor --android-licensesを実行してみます。\\

<code>
C:\Users\murak\src\flutter>flutter doctor --android-licenses
5 of 7 SDK package licenses not accepted. 100% Computing updates...
Review licenses that have not been accepted (y/N)? y

1/5: License android-googletv-license:
---------------------------------------
Terms and Conditions

This is the Google TV Add-on for the Android Software Development Kit License Agreement.
                                ：
</code>

全てのライセンスでyで同意しました。\\

<code>
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.22000.434], locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] 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 (version 2021.1)
[✓] VS Code (version 1.63.2)
[✓] VS Code, 64-bit edition (version 1.26.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

! Doctor found issues in 1 category.
</code>

すると、Androidのチェックは通りました！\\

===== Visual Studioの導入 =====

②についてはVisual Studioが入っていないので導入してみます。\\

  - [[https://visualstudio.microsoft.com/ja/downloads/|こちらからVisual Studioのコミュニティ版]]をダウンロードしてインストール\\   {{:fluttererror2.png?600|}}
  - C++によるデスクトップ開発のみチェックしてインストールしてみます。\\   {{:fluttererror3.png?600|}}
  - インストールできました。\\   {{:fluttererror4.png?600|}}

再度flutter doctorを実行してみると\\
<code>
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.22000.434], locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Chrome - develop for the web
[✓] Visual Studio - develop for Windows (Visual Studio Community 2022 17.0.5)
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.63.2)
[✓] VS Code, 64-bit edition (version 1.26.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

• No issues found!
</code>
エラーはなくなりました！\\