一、下载
1、下载Flutter，在命令行：git clone -b beta https://github.com/flutter/flutter.git
或者可以手动下载Flutter，并放入想放的文件位置，如果是从GitHub自己下载的Flutter，可能会没有.git文件，需要手动创建：git init
二、配置文件.bash_profile
open ~/.bash_profile，如没有创建：touch .bash_profile
添加如下：
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
export PATH=[你的flutter文件路径]/bin:$PATH
三、执行flutter doctor
报错1
fatal: invalid gitfile format: /Users/mac1/flutter-2.5.1/.git
Downloading Dart SDK from Flutter engine b3af521a050e6ef076778bcaf16e27b2521df8f8...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 353 100 353 0 0 2468 0 --:--:-- --:--:-- --:--:-- 2468
[/Users/mac1/flutter/bin/cache/dart-sdk-darwin-x64.zip]
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of /Users/mac1/flutter-2.5.1/bin/cache/dart-sdk-darwin-x64.zip or
/Users/mac1/flutter/bin/cache/dart-sdk-darwin-x64.zip.zip, and cannot find /Users/mac1/flutter-2.5.1/bin/cache/dart-sdk-darwin-x64.zip.ZIP, period.
It appears that the downloaded file is corrupt; please try again.
If this problem persists, please report the problem at:
https://github.com/flutter/flutter/issues/new?template=ACTIVATION.md
解决1：
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
报错2：
Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
解决2：
执行flutter doctor --android-licenses ，一直按y
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