eclipse/ has the examples that eclipse can load (no longer updated). Otherwise, in andriod studio.

basicARDemo a "simple" example that turns on the camera and displays sensor info like gps over the image. This app is need of a lot of updates, include adding permission checking, using camera2 APIs (or support camera if it ever comes out). It was always intended to be a simple demo.

ARmarkersDemo is a demo of drawing 3D objects on the screen when markers are found in the real world. The markers are in markers/ directory of the project. There project is very out of date and has problems, but works. It comes from Pro Android AugmentedReality book, https://github.com/RaghavSood/ProAndroidAugmentedReality I'm going see about updating the example to use current APIs.

ARCoreSimpleDemo is a "simple" example using google's ARCore modules. see https://developers.google.com/ar/ and much of the example is taken from googles hello_ar_java example in https://github.com/google-ar/

These are example code for University of Wyoming, Cosc 4730 Mobile Programming course. All examples are for Android.