安装 Flutter（国内镜像加速）
1️⃣ 下载 Flutter SDK（清华镜像）
git clone https://mirrors.tuna.tsinghua.edu.cn/git/flutter-sdk.git -b stable ~/development/flutter
2️⃣ 配置环境变量
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. 验证
flutter doctor
3️⃣ 验证安装是否成功
flutter doctor
如果一切正常，你会看到：
Flutter 3.x.x • channel stable • https://mirrors.tuna.tsinghua.edu.cn/git/flutter-sdk.git
问题：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 已经装好 ✅，只是现在还缺 Android SDK（也就是 Android 工具链）。
这是 Flutter 在 macOS 上开发 Android 应用的必需部分。
第一次打开 Android Studio 时
启动 Android Studio → 会提示安装几个组件，请务必勾选：
• ✅ Android SDK
• ✅ Android SDK Platform
• ✅ Android Virtual Device (AVD)
• ✅ Android SDK Command-line Tools
然后点击「Next」→「Finish」，等待下载完成。
问题：2
Error: It seems there is already an App at '/Applications/Android Studio.app'.
解决方法
进入菜单栏：
Android Studio → Settings（或 Preferences） → Appearance & Behavior → System Settings → Android SDK
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