How to make Android application from from C++ program using OpenCV

Question

I have a C++ program that starts like this:

#include "opencv2/highgui/highgui.hpp"
#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include <vector>
#include <stdio.h>
#include "linefinder.h"

#define PI 3.1415926

using namespace cv;

int main(int argc, char* argv[]) {
    int houghVote = 200;
    string arg = argv[1];
    bool showSteps = argv[2];

    string window_name = "Processed Video";
    namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
    VideoCapture capture(arg);

I want to make an Android app from it. I have NDK installed but I don't know what I have to do now.

Do I have to change anything in the C++ main program so that it will run on Android, or can I compile and run it unchanged?

Yes, I already check that page, but it doesn't help. I have programs as face detection running, but I don't know how to do use my own C++ code into Android program — Charly
– Charly, Commented Aug 10, 2014 at 19:53

Bull · Accepted Answer · 2014-08-10 23:35:04Z

1

Introduction to Android

Android provides a rich application framework that allows you to build innovative apps and games for mobile devices in a Java language environment. ... Android apps are built as a combination of distinct components that can be invoked individually.

You need to construct your app using Java, then call your C++ code via JNI.

Also, Android NDK has this to say

you should only use the NDK if it is essential to your app—never because you simply prefer to program in C/C++

In particular, read Using the NDK to understand why you can't run your C++ main program without changing anything.

edited Aug 10, 2014 at 23:35

answered Aug 10, 2014 at 23:06

Bull

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