flutter sdk 版本升级到2.0或者更高的版本后，运行之前的代码会报错

Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:- package:flutter_swiper- package:flutter_page_indicator- package:transformer_page_viewFor solutions, see https://dart.dev/go/unsound-null-safetyFAILURE: Build failed with an exception.

这些包不支持 safety模式。我们可以在运行的时候添加–no-sound-null-safety。打开Android Studio，然后依次选择【Run】 -->【 Edit Configurations】 --> 【Add Additional Run args 】–> 【–no-sound-null-safety】，如下图。