Android: Create different application zones (launcher style) [on hold]

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http://stackoverflow.com – I'm trying to create an app, something like the launcher. I want to display all installed applications and let the user move them between layouts\screens (not sure what the exact term is). I know how to display all packages, I know how to drag & drop, but I'm not sure how to create one activity (not sure if it has to be one activity) that contains few "applications zones" that the user can drag them to. Thanks, (HowTos)