Function sendJavaMsg

hello-jniCallback/app/src/main/cpp/hello-jnicallback.cpp:139–144

* A helper function to wrap java JniHandler::updateStatus(String msg) * JNI allow us to call this function via an instance even it is * private function. */

 * private function.
 */
void sendJavaMsg(JNIEnv* env, jobject instance, jmethodID func,
                 const char* msg) {
  jstring javaMsg = env->NewStringUTF(msg);
  env->CallVoidMethod(instance, func, javaMsg);
  env->DeleteLocalRef(javaMsg);
}

/*
 * Main working thread function. From a pthread,