剩下部分
安装flutter
安卓环境需要安装android studio
flutter doctor --android-licenses
进入flutter sdk的目录，打开D:\Program Files\flutter\packages\flutter_tools\lib\src \http_host_validator.dart
（2）将https://maven.google.com/修改https://maven.aliyun.com/repository/google/
cd android ./gradlew clean ./gradlew build