Images in android app

I see three folders within my eclipse project drawable-hdpi,mdpi,ldpi

Do I need to put images in all three of these folders?Or can I just use one of them.My images seem to scale fairly well.I do not want to have duplicate images if it is uneccessary.

I guess what I am asking is will the app be 开发者_如何学JAVAable to find my images if I just use one of the above mentioned folders?

Technically if you drop them in mdpi, I believe all devices 1.6 and above will find them. However, if you support below 1.6 devices you'll need to duplicate the drawable-mdpi resources and call it just drawable.

Yes it will find the Drawables regardless of which directory you use. You can also just have a drawable directory if you don't plan to support different densities.