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How to have a Facebook Key Hash that works to all device or mobile in android

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http://stackoverflow.com – Is there any way to have a Facebook Key Hash that works to all devices or mobile without putting it manually to you Facebook App? Because every time I use another device or mobile I need to put the actual Key Hash and the problem is what if someone used my Android App? then they can't use Facebook Log in because their Key Hash is not Registered to My Facebook App? Can anyone know how to solved this issue? Any thoughts will be highly appreciated. (HowTos)