如何通过两个属性和排序规则对对象列表进行排序 [英] How to sort list of objects by two properties and collator

问题描述

我必须按lastName和firstName对对象列表进行排序(如果多个对象存在相同的lastName).我还必须对这些应用Collat​​or.

I have to sort list of object by lastName and firstName (if case there is the same lastName for multiple objects). I must also apply Collator to those.

假设我可以对一个属性执行此操作:

Suppose I can do that for one property:

val collator = Collator.getInstance(context.getResources().getConfiguration().locale)

myList.sortedWith(compareBy(collator, { it.lastName.toLowerCase() }))

但是是否可以将另一个限制也应用于按firstName排序?

But is it possible to apply also to that another restriction to also sort by firstName?

推荐答案

您可以使用thenBy添加其他排序条件:

You can add another sort criteria with thenBy:

val comparator =
        compareBy(collator) { p: Person -> p.lastName.toLowerCase() }
                .thenBy(collator) { p: Person -> p.firstName.toLowerCase() }
val result = myList.sortedWith(comparator)

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