Generate a 64bit unique ID

Is there a good way to generate a good and unique 64bit ID on Android? I have read on this topic but nothing so far seems to be fitting.

I thought about using ANDROID_ID, but there are reasons that I wont do that, as this seems to be dependant on the manufacturers keeping standarts (which some wont).

UUID.randromUUID() will generate a to big ID (as I want 64bit).

The ID does not have to be kept after the App was deleted also it does not need to in any kind secure (e.g. secure against manipulation).