问题标签 [kotlin-reflect]

我val prop:KMutableProperty1<<A,Any>>在 A 类中有一个字段 x，我可以通过它获取字段名称，prop.name但是如何获取它的容器类名称 (A)？

我有一个在Any类型上运行的扩展方法。在该扩展方法上（其中this指的是目标实例），我正在尝试根据注释存在来过滤 memberProperties。

但it.annotations总是大小为 0

实例上的变量声明示例： @ValidComponent var x: SomeType = constructorParam.something或@ValidComponent lateinit var x: SomeType

我有一个对象的实例，我会扫描它以查找附加了正确注释的 memberProperties。然后，我想根据它们的返回类型进行过滤。例如，如果声明如下：class AutoValidatedThing : AutoValidatedUserInputComponent {...}并且目标实例包含 a @ValidComponent val someProperty: AutoValidatedThing = ...，我希望将somePropertyas aAutoValidatedUserInputComponent放在以下代码块的末尾：

但it.returnType is AutoValidatedUserInputComponent总是返回 false。

AutoValidatedUserInputComponent是一个简单的界面：

我已将 kotlin-reflect 库添加到我的 Android 项目中，现在 Proguard 正在生成数百行注释，列出所有具有名为 字段的类INSTANCE，其中当然包括每个 Kotlin object。

这只是 Proguard 输出的一小部分：

如您所见，它既包括我自己的MySingleton类，也包括来自 Kotlin 标准库的许多类，并且它也可以在任何其他库中找到这些字段（如果存在）。

Will try to keep this as concise as possible...

I would like to have a method in my MainActivty class, say updateUI().

I have another file that is an object called FBManager. That object essentially holds "static" firebase access methods.. let's say signInUser()

From the Activity I call FBManager.signInUser()... It does some logic and moves through 2 private methods and at the last private method, I would like to essentially call MainActivity.updateUI()…</p>

This can't be done as kotlin doesn't have static methods and can't make updateUI() static. MainActivity().updateUI() compiles but is incorrect and don't want to instantiate a new MainActivity. Lastly, I thought of passing the activity into the first constructor like FBManager.signInUser(this)... But after signInUser(), it goes to an override method that can only take a bundle as an optional input (and I don't believe you can put activities into a bundle), thus I can't pass the activity reference to the final private method.....

Edit: Further elaboration

Apologies for layout... Typing on my phone...

-end edit-

I hope all that makes sense as I'm new to programming and find it difficult to explain my problems (since if I truely understood them I could come up with a solution..)

So as per the title, is there any other way to do this... To call a method in MainActivity from an object FBManager?

有没有办法知道收藏信息？

我是 kotlin 的新手，在构建项目中逐步在 android 中安装 kotlin 时，我得到了这个错误，搜索了很多关于如何解决这个问题的问题，但没有解决任何解决方案，比如使缓存/重置无效，请帮助我

我正在尝试匹配String?Kotlin 反射练习中可为空的类型：

唉，它因错误而失败，Type in a class literal must not be nullable, for String?::class。

I would like to return a copy of a class with a different value assigned to a val property.

if age was a var then I could do it like follows:

我想要一个通用的类KProperty1，我可以为一个函数做这个，但不是一个类：