This code always returns Image not loaded, is the path correct .this is opencv in android NDK

Question

JNIEXPORT jstring JNICALL Java_com_weiss_konrad_arrowapp_NDKInterface_getID(JNIEnv *env, jobject o ){
    Mat img =  imread("storage/emulated/0/DCIM/Camera/IMG_20160506_141333.jpg");
    if(img.empty())                             
    {
        return env->NewStringUTF("Image not loaded");
    }

    return env->NewStringUTF("Image loaded");
}

Answer 1

Different devices may use different paths to store the camera pictures. You must use Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) to find the correct path (sometimes it can even be changed by the end-user). I understand that it is a burden to find call this function from C++, so probably you will find it easier to pass this path from Java.