Flutter尝试-sdk版本更新

查看当前flutter通道版本

flutter channel

flutter版本通道切换

flutter channel stable|beta|dev|master。

查看通道是否切换成功

可以使用flutter channel
或者
flutter doctor。可以看见下面运行后显示的是Channel dev (由于我切换stable一直显示unknow就使用dev的最新版本了)

/Users/MacBook/Documents/file/sdk/fluttersdk/flutter2.2.2/bin/flutter doctor --verbose
[✓] Flutter (Channel dev, 2.3.0-24.0.pre, on macOS 11.4 20F71 darwin-x64, locale zh-Hans-CN)
    • Flutter version 2.3.0-24.0.pre at xxx/fluttersdk/flutter2.2.2
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2b9537c783 (2 weeks ago), 2021-06-11 22:11:53 -0700
    • Engine revision ddbac024d1
    • Dart version 2.14.0 (build 2.14.0-188.0.dev)

更新flutter和捆绑的dart到通道的最新版本

flutter upgrade

项目使用版本

在项目更目录的pubspec.yaml文件中

#配置最小支持的版本会影响能用到的新语法多少
environment:
  sdk: ">=2.12.0 <3.0.0"
  flutter: ">=1.17.0"