android - jni在getJavaVM之后获取JavaVm时候总是为NULL

Question

我调用java中的jni， 定义了一个变量:
static JavaVM *pMyJavaVm=NULL，

并且在函数中赋值:
env->GetJavaVM(&pMyJavaVm);

但是当我要用到 pMyJavaVm的时候 打印发现 值为NULL ，这是为什么呢?

Answer 1

The problem is solved, mainly due to the lack of thorough understanding of the C language. It is defined in a global header file, static JavaVM* pMyJavaVm; is included in several cpp files, and the variables in each file are independent, so Citing in other documents is problematic