JNI双向调用（Java调C++/C++调JAVA）

最新推荐文章于 2022-12-16 08:51:08 发布

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本文详细介绍了在Android环境中，如何在C++动态库中获取JavaVM和JNIEnv，以及如何实现JAVA调用C++和C++调用JAVA的交互。主要方法包括通过JNI_OnLoad获取JavaVM，以及在Java中声明并调用C++的native方法传递AssetManager。同时，文章引用了StackOverflow上的解答和官方文档作为参考资料。

C++调JAVA

JAVA调C++

获取JavaVm和JNIenv

如何在一个android进程的动态库C++里获取到JavaVM：

1、参考：Get JavaVM and AAssetManager in native c++ Android Library - Stack Overflow

If you want to cover both cases in the same way ("typical" and "native" app) - the only way is next:

Add MyLibrary.java to your library. That file should declare native method MyLibrary.init(AssetManager am);. Implementation of that method must be placed in your C++ code, where you get java reference to asset manager and then can obtain AAssetManager *
Add JNI_OnLoad() to your library in order to obtain JavaVM*
Build your library as separate .so to allow system to invoke your JNI_OnLoad()

Usage looks next:

Client app declares custom Application class in its manifest
Implementation of this custom class overrides onAttachBaseContext() method, which implementation invokes System.loadLibrary("mylibrary") and then your MyLibrary.init(getAssets()).