Разрешения екрана Android правила

	Low density (120), ldpi	Medium density (160), mdpi	High density (240), hdpi	Extra high density (320), xhdpi
Smallscreen	QVGA (240x320)		480x640
Normalscreen	WQVGA400 (240x400) WQVGA432 (240x432)	HVGA (320x480)	WVGA800 (480x800) WVGA854 (480x854) 600x1024	640x960
Largescreen	WVGA800** (480x800) WVGA854** (480x854)	WVGA800* (480x800) WVGA854* (480x854) 600x1024
Extra Largescreen	1024x600	WXGA (1280x800)† 1024x768 1280x768	1536x1152 1920x1152 1920x1200	2048x1536 2560x1536 2560x1600

I will elaborate more on how exactly does dp convert to px:
If running on hdpi device 150x150 px image will take up 100*100 dp of screen space.
If running on mdpi device 150x150 px image will take up 150*150 dp of screen space.
If running on xhdpi device 150x150 px image will take up 75*75 dp of screen space.

The other way around: say, you want to add an image to your application and you need it to fill 100*100 dp control, you'll need to create different size images for supported screen sizes:
100*100 px image for mdpi
150*150 px image for hdpi
200*200 px image for xhdpi

Получается

mdpi - коэф 1 - 1280х1280 (мин 800)

hdpi - коэф 1,5 - (500) 900х900

xhdpi - коэф - 2 - 2560х1600

Если нет hdpi то андроид умножит mdpi на 1,5 и покажет.

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:)