Launcher Icons for application

I am trying to upload a couple of apps to the Google Play Store but I don't understand exactly how to create my app's icons. This is stated in Processing's Android App Distribution Tutorial: "Android mode uses a set of default launcher icons for the app. You should use your own icons for release by creating the files icon-36, 48, 72, 96, 144, and 192 in .PNG format, and placing them in the sketch's folder before exporting the signed package. Follow the icon design guidelines from Google in order to create your icons."

36, 48, 72, 96 and 144 what? What is this size?

Also, where do I put them in the sketch folder? In the DATA folder?

Thanks in advance!


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