Android support for multiple display sizes

Most Android apps do not seem to scale to larger displays very well.  Some icons seem to remain the same size.  When I run the apps on my TV, I end up with a lot of dead space and hard to click icons.  The air mouse works great for apps that scale well, but works horribly for apps that do not.  I end up missing a lot and clicking the wrong buttons.  I spend too much time trying to turn shuffle on in a music player.  I complained about fullscreen mode in the Youtube app in a previous post.  I am starting to learn how to write Android apps, and I'm making sure to scale the content so that the interface is usable on small and large screens.  The API call I'm using Display.getSize(Point) specifically says not to use that size for scaling purposes, but I have not found another API call that will allow me to do that yet.  The documentation says to use Layouts.  I have not found a way to scale using Layouts.  I still use Layouts for positioning, however.