转换Array< String>到ArrayList< String>

问题描述

如何在Kotlin中将Array<String>转换为ArrayList<String>?

How do I convert Array<String> to ArrayList<String> in Kotlin?

var categoryList : ArrayList<String>?=null
val list = arrayOf("None", "ABC")
categoryList = ArrayList(Arrays.asList(list))

我收到此错误:

错误

Type inference failed. Expected type mismatch: inferred type is kotlin.collections.ArrayList<Array<String>!> /* = java.util.ArrayList<Array<String>!> */ but kotlin.collections.ArrayList<String>? /* = java.util.ArrayList<String>? */ was expected

推荐答案

您可能对 toCollection 将元素添加到您传递的任何集合中:

You may be interested in toCollection to add the elements to any collection you pass:

categoryList = list.toCollection(ArrayList())

请注意，要解决您的特定问题，您只需要传播运算符(*).加上* -fix，它也可以工作:

Note that to fix your specific problem you just need the spread operator (*). With the *-fix applied it would have worked too:

categoryList = ArrayList(Arrays.asList(*list))

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