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。
1 /* JNINativeMethod数组的定义在C和C++中都一样*/ 2 static JNINativeMethod gMethods[] = { 3 { 4 "jobjectProcess", 5 "(Lcom/example/hellojni/HelloJni$Student;Ljava/lang/Integer;)V", 6 (void*)jobjectProcess 7 } 8 /*被省略掉的代码*/ 9 }; 10 11 jint JNI_OnLoad(JavaVM* vm,void* reserved) 12 { 13 JNIEnv* env = NULL; 14 jint result=-1; 15 if( (*vm)->GetEnv(vm,(void**)&env , JNI_VERSION_1_4) != JNI_OK) 16 return result; 17 jclass HelloJniClazz=(*env)->FindClass(env,"com/example/hellojni/HelloJni"); 18 /* C */ 19 jint r=(*env)->RegisterNatives(env, HelloJniClazz, gMethods, sizeof(gMethods) / sizeof(JNINativeMethod)); 20 /* C++ */ 21 r=AndroidRuntime::registerNativeMethods(env,"com/example/hellojni/HelloJni",gMethods,NELEM(gMethods)); 22 /*或者env->RegisterNatives(HelloJniClazz, gMethods, sizeof(gMethods) / sizeof(JNINativeMethod));*/ 23 if(0 == r) 24 //注册native函数成功 25 else 26 //注册native函数失败 27 return JNI_VERSION_1_4; 28 } 29 30 void JNI_OnUnload(JavaVM* vm,void* reserved) 31 { 32 JNIEnv* env = NULL; 33 if( (*vm)->GetEnv(vm,(void**)&env , JNI_VERSION_1_4) != JNI_OK) 34 return; 35 jclass HelloJniClazz=(*env)->FindClass(env,"com/example/hellojni/HelloJni"); 36 /* C */ 37 jint r=(*env)->UnregisterNatives(env,HelloJniClazz); 38 /* C++ */ 39 jint r= env->UnregisterNatives(HelloJniClazz) 40 if(r == 0) 41 //注销native函数成功 42 else 43 //注销native函数失败 44 }
