kotlin - 注释类未将输入验证为Kotlin中的枚举

Question

我想创建注释，而不是枚举，当语句时将其用于

@Retention(AnnotationRetention.SOURCE)
@IntDef(SELECT.toLong(), WEAR.toLong(), BAND.toLong())
annotation class CurrentState

companion object {
 const val SELECT = 0
 const val WEAR = 1
 const val BAND = 2
} 

private fun handleFragment(@CurrentState state:Int) {
 val fragment:Fragment =
 when(state){
 SELECT -> SelectDeviceFragment.newInstance()
 WEAR -> ConnectWatchFragment.newInstance()
 BAND -> SelectDeviceFragment.newInstance()
 }

据我了解，此代码应阻止我执行以下代码:

handleFragment(5)

和when语句不应要求我添加或语句，如枚举预期
我在做错还是误解？

Answer 1

从https://discuss.kotlinlang.org/t/intdef-and-stringdef-not-being-checked-at-compile-time/7029:

This checking doesn’t come from the compiler, but from Android lint. Work to make android lint language independent is being done, but if I’m not mistaken you’ll need a newer version of Android Studio for it.

Android Studio 3.1 blog post提到了针对Kotlin的lint检查功能(尽管并没有说明是否特别支持该检查)。