icons4android is the easiest way to get a bunch of icons in the formats we need. The license for use (copied below) requires attribution.
The icons in this ZIP file were downloaded from http://icons4android.com
All icons are licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) (http://creativecommons.org/licenses/by/3.0/)
Please note that one condition of this license is attribution.
If you use these icons in your project(s), you must add a link to
http://icons4android.com
on your website or playstore site.
Example of correct attribution:
App icons by <a href="http://icons4android.com">Icons4Android</a>.
icons4android is the easiest way to get a bunch of icons in the formats we need. The license for use (copied below) requires attribution.