This is a simple Android AR Demo based on OpenCV, this project is based on OpenCV Android Calibration and the code from book : mastering opencv with practical computer vision projects.
this app can be built with Android Studio 2.3 with NDK support directly. images for calibration and marker are in images.
You should calibrate the mobile camera with this app first and print the marker in the book to show the AR functions. There is a video to show the process.