Android: Listening for variable changes

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http://stackoverflow.com – I've been searching for a KISS example of how to do this, and while they all seem (and I've gone through them ALL!) simple enough, I still cannot get my head around the concept. I'm referring to custom listeners (ones that do not extend anything)... In particular, creating a listener for a boolean variable so that I can set off some methods when its value changes. this is an example of an example I've tried: android how to make listener to a custom variable? If someone has the time to explain a custom listener and how it works in plain English, that would be much appreciated. I'm hoping t (HowTos)