Once you have integrated a Unity module in an Android app, you should add the following to make sure you’re not launching the module on devices that do not support ARCore. It also instructs users to install the ARCore app for devices that support it, but don’t have it yet.

These instructions were found here originally, and are slightly modified to solve some more errors.

We’ve noticed that the Unity editor often resets the package name of your project when you save it or when you close the build settings. Make sure to check for this (you will see the wrong package in the editor) and correct it if needed.

Add the following script to your scene to allow the Back button on Android to exit the application: