下面举一个例子
java实现函数
public native boolean changeAccountPasswd(byte[] passwd,int len);
Native 层的实现
JNIEXPORT jboolean JNICALL Java_com_frank_smart_smarthome_JniSocket_changeAccountPasswd
(JNIEnv *env, jobject object,jbyteArray passwd,jint len)
{
jbyte *bytes;
unsigned char *buf;
int i;
//从jbytearray获取数据到jbyte*
bytes = env->GetByteArrayElements(passwd,NULL);
if(bytes == NULL) {
return false;
}
buf =(unsigned char *)calloc(len,sizeof(char));
if(buf == NULL)
{
return false;
}
for(i=0;i<len;i++)
{
*(buf+i)=(unsigned char)(*(bytes+i));
}
//释放资源
env->ReleaseByteArrayElements(passwd,bytes,0);
__android_log_write(ANDROID_LOG_ERROR,"TAG",(char*)buf);
free(buf);
return true;
}
可参考如下链接中代码,未验证