1  #include <jni.h>
 2  #include <string>
 3  
 4  extern "C" JNIEXPORT jstring JNICALL
 5  Java_com_harmoniis_os4_MainActivity_stringFromJNI(
 6          JNIEnv* env,
 7          jobject /* this */) {
 8      std::string hello = "Hello from C++";
 9      return env->NewStringUTF(hello.c_str());
10  }