How to move button for it not to brake on different resolutions

Hey, I've been doing my first big app on Android, but I got a problem. I have 3 buttons at the bottom. Each represents it's own menu. When i press one of them it goes up, others should move up too and disappear. When I press it again all buttons go down. The problem is to optimize it for different resolutions. If I change it from original 2160x1080 to let's say 2400x1080 the menu looks fine but buttons don't go up as much, so it stays on top of the menu. Any fix to this problem ?