问题描述:
1.首先，添加image_picker一个在pubspec.yaml文件相关
终端输入flutter pub get ,悲哀得事发生啦，报错拉拉
The current Dart SDK version is 2.1.0-dev.9.4.flutter-f9ebf21297. Because imagedemo depends on image_picker >=0.0.2 < 0.3.0 which requires SDK version >=1.8.0<2.0.0,version solving failed.
上面得错误提示是版本得问题，那么我们就按照提示，更改版本
我这里更改了image_picker得版本
更改后再次输入flutter pub get，成功拉
https://pub.dev/ https://flutter.dev/docs/development/packages-and-plugins/using-packages#example-using-the-css_colors-package
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