Java/Kotlin注释处理器:获取带注释的字段/属性的类型

问题描述

例如，我有一个课程:

class Foo {
  @AnnotatedProp
  var foo: Boolean? = null
}

如何在自定义注释处理器中获取foo属性的类型?伪我希望这样的事情:annotatedElement.getStringifiedReturnTypeSomehow() //returns "Boolean"

How can I get type of foo property in my custom annotation processor?in pseudo I'd expect something like:annotatedElement.getStringifiedReturnTypeSomehow() //returns "Boolean"

推荐答案

我完成此操作的方式，请确保您的注释具有AnnotationTarget.FIELD目标.

The way I've done it, ensure your annotation has an AnnotationTarget.FIELD target.

获得带有必需注释的Element实例之后，只需:val returnTypeQualifiedName = element.asType().toString()如果要确定它是否可以为空:

Than after you get the Element instance with required annotation, just:val returnTypeQualifiedName = element.asType().toString()if you want to find out if it's nullable:

private fun isNullableProperty(element: Element): Boolean {
        val nullableAnnotation = element.getAnnotation(org.jetbrains.annotations.Nullable::class.java)
        if (nullableAnnotation == null) {
            return false
        } else {
            return true
        }
    }

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