JoinBelieve/BasicStateCodelab

https://developer.android.com/codelabs/jetpack-compose-state?hl=zh-cn&continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fcompose%3Fhl%3Dzh-cn%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fjetpack-compose-state#12

Kotlin