Prodigital
All Star
Right, I forgot.Vector based images( which alot of Mobile games use ) scale better than raster images.
A free vector program is Inkscape http://www.inkscape.org/en/
http://designwashere.com/design-battle-vector-vs-raster/
Rasters arent bad, just depends on the use case. Mix em down to PNG with some transparency and youre straight, but those images cant be resized. Thats really the main problem with coding on android is no telling what device resolution its going on so 9 time out of ten it wont look as crispy.
In that case with android you have to make a DPI table and the graphics will be loaded according to that. He'd have to render a version of the image for every DPI.
Photoshop imports into illustrator so thats not a problem. I just suggest illustrator because of it's god tier vectoring. If you re sized the image you posted to fit on a phone as a icon its gonna look like shyt. You can vector in photoshop but it's a pain. Really breh, don't shun the glory of the pen tool.What if I've already drawn most of them in photoshop? Plus I suck at using Illustrator.
Here's an example of one of my icons:
