Thais is what I have done. I try to support this screen sizes:
xlarge screens 640dp x 960dp
large screens 480dp x 800dp
normal screens 320dp x 400dp
small screens 240dp x 400dp
So I create etc. background images with that sizes (640dp x 960dp, 480dp x 800dp, 320dp x 400dp and 240 x 400). I put images in folders drawabale-xhdpi, drawabale-hdpi, drawabale-mdpi and drawabale-ldpi. When I have xlarge screen with hdpi density (it use images from hdpi folder), graphic is bad (images are not large enough). So how to use that xlarge image when I have hdpi density. Do I have to create more images and put them in some places? This is a game, I draw all in canvas, don't use layouts for drawing images.
Thanks.