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Are there known bugs or issues with getConnectionInfo().getMacAddress() when it’s used as a unique device identifier?
One of the alternatives, the Android ID, seems to be not available (or not really unique) on some tablets. FAIL…
In this video from last year Google I/O, Reto Meier talked about exactly that problem off identifieng a device correctly.
For the solution you will have to watch the video, because I don’t remember it anymore. But I do remember his concerns about the “MacAddress”-Solution. The problem about this solution his that it addresses a particular device and not a particular “installation”, think of the problem when a user, who installed your app, sells his phone to another person which will also install your app. With the MacAddress you have no chance to distinct between those two …