Android multiple screen sizes with same density

Question

I\'m confused regarding the densities. I see that with medium density, the screen resolution could be either 320x480, 480x800, or 480x854. So if I have an image thats 300px

Answer 1

This is what Device Independent Pixels (DIPs) are for. Instead of 320px write 320dip.

http://developer.android.com/guide/practices/screens_support.html