ndk unsigned char[16]的转换然后返回到java

#include
#include"md.h"
#include
#include
extern "C" {
jstring Java_JNI_jni_getnameFromJNI(JNIEnv* env, jobject thiz) {

unsigned char c[16]={'a'};
std:: string str="00000";
str+=c[0];
const char* s=str.c_str();
return env->NewStringUTF(s);

}
}