NDK(15)在ndk代码中注册和注销native函数

　　转自:  http://www.cnblogs.com/canphp/archive/2012/11/13/2768937.html

C和C++注册native函数的方式大致上相同，下面给出具体的代码。

 /* JNINativeMethod数组的定义在C和C++中都一样*/
 static JNINativeMethod gMethods[] = {
     {
         "jobjectProcess",
         "(Lcom/example/hellojni/HelloJni$Student;Ljava/lang/Integer;)V",
         (void*)jobjectProcess
     }
     /*被省略掉的代码*/
 };  

 jint JNI_OnLoad(JavaVM* vm,void* reserved)
 {
     JNIEnv* env = NULL;
     jint result=-;
     if( (*vm)->GetEnv(vm,(void**)&env , JNI_VERSION_1_4) != JNI_OK)
         return result;
     jclass HelloJniClazz=(*env)->FindClass(env,"com/example/hellojni/HelloJni");
     /* C */
     jint r=(*env)->RegisterNatives(env, HelloJniClazz, gMethods, sizeof(gMethods) / sizeof(JNINativeMethod));
     /* C++ */
     r=AndroidRuntime::registerNativeMethods(env,"com/example/hellojni/HelloJni",gMethods,NELEM(gMethods));
     /*或者env->RegisterNatives(HelloJniClazz, gMethods, sizeof(gMethods) / sizeof(JNINativeMethod));*/
     if( == r)
         //注册native函数成功
     else
         //注册native函数失败
     return JNI_VERSION_1_4;
 }  

 void JNI_OnUnload(JavaVM* vm,void* reserved)
 {
     JNIEnv* env = NULL;
     if( (*vm)->GetEnv(vm,(void**)&env , JNI_VERSION_1_4) != JNI_OK)
         return;
     jclass HelloJniClazz=(*env)->FindClass(env,"com/example/hellojni/HelloJni");
     /* C */
     jint r=(*env)->UnregisterNatives(env,HelloJniClazz);
     /* C++ */
     jint r= env->UnregisterNatives(HelloJniClazz)
     if(r == )
         //注销native函数成功
     else
         //注销native函数失败
 }