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

For completeness, also check these option for controlling layout:

Directory qualifiers:

Size:         small, normal, large
Density:      ldpi, mdpi, hdpi, nodpi(no auto-scale)
Aspect ratio: long, notlong
Orientation:  land

Usage:

res/layout/my_layout.xml            
res/layout-small/my_layout.xml      
res/layout-large/my_layout.xml      
res/layout-large-long/my_layout.xml      
res/layout-large-land/my_layout.xml     
res/drawable-ldpi/my_icon.png  
res/drawable-mdpi/dpi/my_icon.png  
res/drawable-hdpi/my_icon.png      
res/drawable-nodpi/composite.xml   

Restricting your app to specific screen sizes(via the AndroidManifest):

...

...

And for code level tweeking:

float scale = getContext().getResources().getDisplayMetrics().density;

And don't forget:

dpi    = 160; //At 160dpi
pixels = dips * (density / dpi)

It's all in this doc: developer.android.com:Supporting Multiple Screens