Supporting Multiple Screens for some devices in Android

I read the official document about supporting multiple screens http://developer.android.com/guide/practices/screens_support.html

According to that document, I should just create different directories for different resolultion.

Now the question. How to support devices with normal screen and high density or low density?

I ask it because, there are two posibilities (WVGA800 (480x800) and WVGA854 (480x854)) and (WQVGA400 (240x400) and WQVGA432 (240x432)) and I don't know where to store some background images for them.

I would take drawable-normal-hdpi or drawable-normal-ldpi, but how to make difference between 480x800 and 480x854 or between 240x400 and 240x432?!

Thank you in advance,

Mur

This is the documentation on how to specify alternate resources.

So you could do drawable-normal-hdpi for medium screens with high dpi.

you have to specify layout folder like following:-

layout-small-ldpi (240x320)  
layout-small-land-ldpi (320x240)

layout-ldpi  (240 x 400 )
layout-land-ldpi  (400 x 240 )

layout-mdpi (320 x 480 )
layout-land-mdpi (480 x 320 )

layout-large-mdpi (320 x 480 )
layout-large-land-mdpi (480 x 320)

layout-large  (600 x 1024)
layout-large-land  (1024 x 600)

layout-hdpi (480 x 800)
layout-land-hdpi (800 x 480)

layout-xlarge (800 x 1280)
layout-xlarge-land (1280 x 800)