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