[英]Kotlin: Java can't resolve Kotlin Symbol?
I have a Kotlin Code just like the below, SingleKotlin.instance
can be called by the other Kotlin files 我有一个Kotlin代码,如下所示,
SingleKotlin.instance
可以被其他Kotlin文件调用
class SingleKotlin private constructor(){
companion object {
val instance by lazy {
SingleKotlin()
}
}
}
However, when I try to call SingleKotlin.instance
from java, it shows can't resolve symbol 'instance' 但是,当我尝试从java调用
SingleKotlin.instance
时,它显示无法解析符号'instance'
I don't understand why, anybody can explian and how can I solve this problem? 我不明白为什么,任何人都可以探索,我该如何解决这个问题?
Just add @JvmStatic annotation above field (as said in this documentation https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html#static-fields ) 只需在字段上方添加@JvmStatic注释(如本文档中所述https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html#static-fields )
So, your code should be like this: 所以,你的代码应该是这样的:
class SingleKotlin private constructor(){
companion object {
@JvmStatic
val instance by lazy {
SingleKotlin()
}
}
}
And now you can call it like 现在你可以这样称呼它
SingleKotlin.instance
In addition to @YuriiKyrylchuk 's answer: another option (and the only option if you don't have control over the Kotlin code) is to refer to MyClass.Companion
from Java. 除了@YuriiKyrylchuk的回答:另一个选项(如果你无法控制Kotlin代码,唯一的选择)是从Java引用
MyClass.Companion
。 Example: 例:
class MyClass {
companion object {
val x: Int = 0
}
}
And in Java: 在Java中:
MyClass.Companion.getX();
If your SingleKotlin
object has a single private constructor without parameters, you can use object
instead: 如果您的
SingleKotlin
对象有一个没有参数的私有构造函数,则可以使用object
:
object SingleKotlin {
// some members of SingleKotlin
val x = 42
}
Then in Java you reference it through the INSTANCE
static field: 然后在Java中通过
INSTANCE
静态字段引用它:
SingleKotlin single = SingleKotlin.INSTANCE;
// or
SingleKotlin.INSTANCE.getX();
您需要像这样从Java调用该方法:
AppUIUtils.Companion.yourMethod()
In additional to Ilya answer you can use @JvmStatic annotation 除了Ilya答案,你可以使用@JvmStatic注释
object SingleKotlin {
// some members of SingleKotlin
@JvmStatic val x = 42
}
Then in Java 然后在Java中
SingleKotlin.getX();
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