http://blog.csdn.net/typename/article/details/6729592
近期通过研究SDL源码 得出android JNI c/c++调用java 无需新建虚拟机： 具体步骤如下
第一步获得：两个参数 JNIEnv和jclass
void Java_com_Test_Audio_Init( JNIEnv* env,jclass cls, jobject thiz )
{
InitJNI(env,cls);
}
bool InitJNI(JNIEnv* env,jclass cls)
{
m_Env=env;
m_cls=cls;
}
第二步
获得java那边定义的函数的名字
jmethodID midCreateGLContext = env->GetStaticMethodID(cls,"Test_Audio","([B)Z");
midCreateGLContext = m_Env->GetStaticMethodID(m_cls,"Test_Audio","([B)Z");
midInitSound=m_Env->GetStaticMethodID(m_cls,"init","()V");
midLoadSound=m_Env->GetStaticMethodID(m_cls,"load","(Ljava/lang/String;I)V");
midLoadMedia=m_Env->GetStaticMethodID(m_cls,"load","(Ljava/lang/String;)V");
| ava类型 | 对应的签名 |
| boolean | Z |
| byte | B |
| char | C |
| shrot | S |
| int | I |
| long | L |
| float | F |
| double | D |
| void | V |
| Object | L用/分割包的完整类名; Ljava/lang/String; |
| Array | [签名 [I [Ljava/lang/String; |
第三步 传递参数调用java 函数
char *str="god_is_a_girl.mp3";
char str[]="nihao";
jbyte *by = (jbyte*)str;
jbyteArray jarray = m_Env->NewByteArray(strlen(str));
m_Env->SetByteArrayRegion(jarray, 0, strlen(str), by);
///调用java函数
m_Env->CallStaticBooleanMethod(m_cls, midCreateGLContext,jarray);