Android Kotlin - Classifier 'Activity' 没有伴随对象，因此必须在这里初始化

Question

        var acct = Activity

        when {
            activityName.contains("MainActivity", true) -> {
                acct = (context as MainActivity)

            }
            activityName.contains("UserMemes", true) -> {
                acct = (context as UserMemes)

            }
            activityName.contains("SearchShow", true) -> {
                acct = (context as SearchShow)

            }
        }

        acct.memeIdAndLastPos[meme.id] = scrollY

我 Classifier 'Activity' does not have a companion object, and thus must be initialized here 在 Activity

当我改为 Activity() 时错误消失，但我不能再使用 memeIdAndLastPos。

如何修复？

Answer 1

val acct: Activity = when { 
  activityName.contains("MainActivity", true) ->  context as MainActivity
  activityName.contains("UserMemes", true) ->  context as UserMemes
  activityName.contains("SearchShow", true) -> context as SearchShow  
}

acct.memeIdAndLastPos[meme.id] = scrollY

Android Kotlin - Classifier 'Activity' 没有伴随对象，因此必须在这里初始化

Android Kotlin - Classifier 'Activity' does not have a companion object, and thus must be initialized here

android

android-context

kotlin