如何知道Jobject所属的jclass(JNI) [英] How to know the jclass to which a jobject belongs (JNI)

问题描述

我需要从我的JNI代码中调用相同的本机C方法.此方法接收通用的 jobject 对象，但是其行为因对象本身的类型而异.

我有两个 jclass 对象，分别名为activityCls和fragmentCls(它们分别映射Java中的Activity类和Fragment类).为了知道给定的 jobject 对象是activityCls还是fragmentCls，该怎么办?

解决方案

如何使用 IsInstanceOf ?

IsInstanceOf

jboolean IsInstanceOf(JNIEnv * env，jobject obj，jclass clazz);

测试对象是否是类的实例.

JNI文档

I need to call the same native C method from my JNI code. This method receives a generic jobject object, but its behavior is different depending on the type of the object itself.

I have two jclass objects, named activityCls and fragmentCls (which respectively map an Activity class and a Fragment class in Java). What can I do in order to know if the given jobject object is of kind activityCls or fragmentCls?

解决方案

How about using IsInstanceOf?

IsInstanceOf

jboolean IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz);

Tests whether an object is an instance of a class.

JNI documentation

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