flutter sdk 版本升级到2.0或者更高的版本后就发现运行时会报错：

Error: Cannot run with sound null safety, because the following dependencies
don‘t support null safety:

 - package:loading_indicator_view
 - package:flutter_swiper
 - package:flutter_page_indicator
 - package:transformer_page_view

For solutions, see https://dart.dev/go/unsound-null-safety


FAILURE: Build failed with an exception.

也就是说以上有些包不支持 safety模式。

解决方案：--no-sound-null-safety

• run
  flutter run --no-sound-null-safety
• build
  flutter build apk --no-sound-null-safety

这里还有更多方式

已解决 ： Error: Cannot run with sound null safety, because the following dependencies