英文:
Implement completion handler lambda in Android java
问题
我在Kotlin中有一个带有如下回调函数的方法，
@JvmStatic
fun getContents(callBack:(filePath:String,name:String,expiry:Int,metadata:String) -> Unit){
}
我可以在Kotlin中访问这个函数，但如何从Java类中访问它呢？
英文:
I have a method in Kotlin which has a callback function like below,
@JvmStatic
fun getContents(callBack:(filePath:String,name:String,expiry:Int,metadata:String) -> Unit){
}
I can access this function in kotlin, but how can I access this from a Java class?
答案1
得分: 0
以下是您要翻译的内容：
用例＃1 - kotlin文件中的函数
例如，如果您有以下kotlin文件：Content.kt
文件的内容将如下所示：
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
然后，您可以从Java中像以下这样调用它：
ContentKt.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
用例＃2 - kotlin文件中的函数，更改jvm名称
如果您想要删除添加到文件名的kt或者为它指定任何其他逻辑名称，还可以指定@file:JvmName(...)：
@file:JvmName("Content")
package test
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
然后，您可以像这样调用它：
Content.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
用例＃3 - 伴生对象中的静态函数或在对象中
考虑以下kotlin类：
class Content {
companion object {
@JvmStatic
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
}
}
或者以下对象：
object Content {
@JvmStatic
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
}
您将通过Java这样访问它：
Content.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
英文:
You have many ways, I'll list some of them below and it should help direct you to build it the way you want.
Use case #1 - function inside a kotlin file
If you have the following kotlin file for example: Content.kt
The content of the file will be something like:
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
Then from Java you can call it like the following:
ContentKt.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
Use case #2 - function inside a kotlin file, changing the jvm name
You can also specify @file:JvmName(...) if you want to remove the kt that is added to the file name or if you want to give it any other logical name:
@file:JvmName("Content")
package test
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
Then you can call it like that:
Content.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
Use case #3 - static function inside companion object or in an object
Given the following kotlin class:
class Content {
companion object {
@JvmStatic
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
}
}
Or the following object:
object Content {
@JvmStatic
fun getContents(callBack: (filePath: String, name: String, expiry: Int, metadata: String) -> Unit) {
}
}
You will access it like that via Java:
Content.getContents((filePath, name, expiry, metadata) -> {
return Unit.INSTANCE;
});
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