JNI_Onload的实现

http://stackoverflow.com/questions/2453692/jni-loses-reference-to-native-methods

void onChange(JNIEnv *, jobject, jfloat);


JNINativeMethod methods[] = {
    {"onChange", "(F)V", (void *)onChange}
};


jint JNI_OnLoad(JavaVM *jvm, void *reserved) {
    JNIEnv *env;
    (*jvm)->GetEnv(jvm, (void**)&env, JNI_VERSION_1_4);


    jclass inheritance = (*env)->FindClass(env, "Inheritance");
    (*env)->RegisterNatives(env, inheritance, methods, 1);


    jobject o_inheritance = (*env)->NewObject(env, inheritance, (*env)->GetMethodID(env, inheritance, "", "()V"));
    jclass provider = (*env)->FindClass(env, "Provider");
    jobject o_provider = (*env)->NewObject(env, provider, (*env)->GetMethodID(env, provider, "", "()V"));


    (*env)->CallVoidMethod(env, o_provider, (*env)->GetMethodID(env, provider, "registerChange", "(LListener;)V"), o_inheritance);
    (*env)->CallVoidMethod(env, o_provider, (*env)->GetMethodID(env, provider, "sendMsg", "()V"));


    return JNI_VERSION_1_4;
}


void onChange(JNIEnv *env, jobject self, jfloat f) {
    printf("[C] %f\n", f);
}