Kotlin中的参考Java接口静态字段 [英] Reference Java interface static fields in Kotlin

问题描述

我可以从Kotlin引用Java接口字段吗?我有这个Java接口:

Can I reference Java interface fields from Kotlin? I have this Java interface:

public interface BaseColumns {
    public static final String _ID = "_id";
    public static final String _COUNT = "_count";
}

我在Kotlin中实现了

And I implement it in Kotlin:

object UserEntry : BaseColumns {
    // some code
}

当我尝试UserEntry._ID时，会得到未解决的参考.如何访问_ID?我想念什么吗?谢谢！

I get Unresolved reference when I try UserEntry._ID. How can I access the _ID? Am I missing something? Thanks!

推荐答案

在Kotlin中，与Java不同，接口的静态成员不会派生，并且在不限定接口名称的情况下不能在子类中调用.

In Kotlin, unlike Java, static members of interfaces are not derived and cannot be called in subclasses without qualifying the interface name.

您应该通过BaseColumns引用_ID:BaseColumns._ID将起作用.

You should reference _ID through BaseColumns: BaseColumns._ID will work.

对于类而言，这似乎是不同的:基类的静态成员的非限定名称可以解决该问题，但该成员仍未继承.

This seems to be different for classes: non-qualified name of a base class static member resolves to it, but the member is still not inherited.

这篇关于Kotlin中的参考Java接口静态字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！