Question

Is there a build-in functionality to provide different resources for different screen sizes (in pixels)

What I found is a solution to separate them by dpi (using hdpi, ldpi, mdpi or sw320dp, sw720dp folders):
http://developer.android.com/guide/topics/resources/providing-resources.html#AlternativeResources

But I don’t care about densities!
My application mostly uses Bitmaps and Canvas, and all I want is to avoid scaling (and smoothing) of these bitmaps.

Answer 1

But I don’t care about densities! My application mostly uses Bitmaps
and Canvas, and all I want is to avoid scaling (and smoothing) of
these bitmaps.

Have you tried using drawable-nodpi or raw for your bitmaps?