安裝 Flutter（國內(nèi)鏡像加速）
1?? 下載 Flutter SDK（清華鏡像）

git clone https://mirrors.tuna.tsinghua.edu.cn/git/flutter-sdk.git -b stable ~/development/flutter

2?? 配置環(huán)境變量

echo 'export PATH="$PATH:$HOME/development/flutter/bin"' >> ~/.zshrc
echo 'export PUB_HOSTED_URL=https://mirrors.tuna.tsinghua.edu.cn/dart-pub/' >> ~/.zshrc
echo 'export FLUTTER_STORAGE_BASE_URL=https://mirrors.tuna.tsinghua.edu.cn/flutter' >> ~/.zshrc
source ~/.zshrc

# 1. 克隆 flutter (stable)
git clone https://github.com/flutter/flutter.git -b stable ~/.flutter

# 2. 添加 PATH
echo 'export PATH="$PATH:$HOME/.flutter/bin"' >> ~/.zshrc
source ~/.zshrc

# 3. 驗(yàn)證
flutter doctor

3?? 驗(yàn)證安裝是否成功

flutter doctor

如果一切正常，你會(huì)看到：

Flutter 3.x.x ? channel stable ? https://mirrors.tuna.tsinghua.edu.cn/git/flutter-sdk.git

問題：1
[?] 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.

你的 Flutter 已經(jīng)裝好 ?，只是現(xiàn)在還缺 Android SDK（也就是 Android 工具鏈）。
這是 Flutter 在 macOS 上開發(fā) Android 應(yīng)用的必需部分。

第一次打開 Android Studio 時(shí)

啟動(dòng) Android Studio → 會(huì)提示安裝幾個(gè)組件，請(qǐng)務(wù)必勾選：
    ?   ? Android SDK
    ?   ? Android SDK Platform
    ?   ? Android Virtual Device (AVD)
    ?   ? Android SDK Command-line Tools

然后點(diǎn)擊「Next」→「Finish」，等待下載完成。

問題：2

Error: It seems there is already an App at '/Applications/Android Studio.app'.

解決方法
進(jìn)入菜單欄：
Android Studio → Settings（或 Preferences） → Appearance & Behavior → System Settings → Android SDK

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