I made a cookie clicker clone in android studio. The amount of cookies was made using shared preferences to save the amount between sessions.

 

A recycler view was implemented for the upgrade menu. The upgrades are also fetched from a website with a JSON-file and converted on start to set up the recycler view with the correct upgrades.

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This was done to satisfy criteria for a course and is not necessarily how I would have solved it in another scenario (especially the JSON objects for the upgrades).