I want to design a background for android application using Photoshop , let's say I have Samsung S4,So I set the resolution to the maximum of that device which is 1080x1920 and 441dpi

Now,my question is where should i insert it in what subfolder of Resources and depending on what we choose that folder 

-drawable-hdpi  

-drawable-ldpi  

-drawable-mdpi  

-drawable-xhdpi  

-drawable-xxhdpi

What image feature decides on which folder image should be in?