Android developers don't need to be messing around with icons and image file types just to get an arrow button to look the way it should look - there are better things to do with your time. To that end, Joan Zapata has created Iconify, which allows Android developers to use any of Dave Gandy's 370 FontAwesome icons in an easily scalable and customizable form. Zapata puts it like this:
If, like me, you're tired of copying 5 images (ldpi, mdpi, hdpi, xhdpi, xxhdpi) for each icon you want to use in your app, for each color you want to use them with, and bang your head on the wall when you suddently need to change their color or size, then I think
Iconifycan help you.
Zapata also includes a couple of "getting started" sections to help you add icons to your TextViews, ImageViews, and ActionBar, along with some example icons:
Check out the Iconify GitHub for details on how it all works.