新手请问null safety如何解决

[ounione]

提示了Because wanandroid_flutter depends on flutter_swiper >=0.0.2 which doesn't support null safety, version solving failed.

The lower bound of "sdk: '>=2.0.0-dev.48.0 <3.0.0'" must be 2.12.0 or higher to enable null safety.
试了下改版本为sdk: '>=2.12.0 仍然没有成功

[yechaoa]

sdk: '>=2.12.0 会默认开启空安全检查，flutter_swiper已经不维护了，所以暂时没迁移。

sdk改成如下可以运行：
environment:
sdk: ">=2.1.0 <3.0.0"