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Pre Requisities

Use a Linux OS. It is assumed that Arch Linux is used.
Install the latest version of Android Studio.
Use SDK Manger of Android Studio to install your SDK 25, NDK 21.4.7075529, and BuildTools 25.0.3 of your choice.
Install the packages that we are going to need on your linux: sudo pacman -S cmake git aria2 ant unzip ant
Make sure you have a suitable python2, python3, and jdk

If you need the cv1 interface of OpenCV, you should use version < 4. Versions>=4 only have the cv2 interface. We are going to use OpenCV 3.4.16 .

Follow this gist to build OpenCV shared library for Android.
Create a new project, Java, MinSDK API26.
In Project Side Bar, right click on App and select New -> Folder -> JNI Folder.
Check the Change Folder Location check box and rename the last part of the path from src/main/jni/ to src/main/jniLibs/ .
Go to your OpenCV/01_ndk_outputs/sdk/native/libs source directory and select all the folders and copy them into jniLibs of your Android Studio project.
It is assumed that your phone is a arm64-v8a.
Open your app's build.gradle and add this to defaultConfig entry:

externalNativeBuild{
            cmake{

icpx crashes or generates executable that crashes when the cache config extension is used.

#include <chrono>
#include <iostream>
#include <cassert>
#include <cmath>

	#!/storage/xbin/bash

	# This script should help forward VPN over any tethered connection on a Android device. Turn on tethering, then enable VPN, then run this script.

	# Inital variable setup
	tethering=0

	# Setup iptables before forwarding VPN
	iptables -A POSTROUTING -o tun0 -j MASQUERADE -t nat

	#!/bin/bash

	echo "Dont forget to allow TCP port 5901 in your instance's security group. You have to add it manually to the inbound rules."
	echo "This script is tested on Amazon Linux 2"
	echo "You have to use a VNC client to connect to your server. You can use Vinagre for example."

	# Detect the current user
	USER=$(whoami)
	echo "Detected user: $USER"

	#!/bin/bash

	# Check if an argument was provided
	if [ -z "$1" ]; then
	echo "Usage: $0 <install dir>"
	exit 1
	fi

	# Assign the first argument to a variable
	installdir="$1"