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

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

flutter sdk提示不是支持 null safety模式

解决方法：

flutter run --no-sound-null-safety

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

亲测有效，仅做记录！