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Android Build a Simple Android App (retired 2014) Shaking Things Up The Activity Lifecycle

ShakeDetector.java info

I understand how to implement the ShakeDetector class that Ben made but I also want to understand how he made the class. I was reading his comments which were helpful but I still need a little more help understanding how how he wrote the ShakeDetector.java class that was implemented. I looked through the developer website and I couldn't find anything that gave me the answers. Will anyone send me a link to a webpage that teaches it or maybe explain it here. Thanks in advance!