Skeleton of JNI file for reading image in native layer.

image-loader-jni.cc

#include <jni.h>

// Corresponding to NativeImageLoader class in
// dev.minhazav.samples package.
extern "C" JNIEXPORT jstring JNICALL
Java_dev_minhazav_samples_NativeImageLoader_readFile(
    JNIEnv* env, jclass, jint fd) {
    if (fd < 0) {
        return env->NewStringUTF("Invalid fd");
    }

    // TODO: read the image.

    return env->NewStringUTF("Dummy string");
}