なんとなくまだ古くさい感じはありますが。

val context = LocalContext.current

fun Context.getActivityOrNull(): Activity? {
    var context = this
    while (context is ContextWrapper) {
        if (context is Activity) return context
        context = context.baseContext
    }    
    return null
}

fun Context.findActivity(): Activity {
    var context = this
    while (context is ContextWrapper) {
        if (context is Activity) return context
        context = context.baseContext
    }
    throw IllegalStateException("Permissions should be called in the context of an Activity")
}

👉 android - How to get activity in compose - Stack Overflow

関連ワード:  Android・AndroidStudio・JetpackCompose・Kotlin・今さら聞けない・便利な設定・初心者・開発