Android Launcher Icons for PhoneGap not changing

I've had the hardest time changing launcher icons for my Android application built with PhoneGap.  I would change the icons in the res/drawable-hdpi, res/drawable-ldpi, and res/drawable-mdpi, folders in Eclipse, compile my app so that it launched on the phone, and the icon just would not change.  It had worked before, I had a custom icon in there, I just couldn't get it to change again.

So I would just leave the new icon there and give up on it for a while.  Then, seemingly for no reason, the icon would eventually update at some point, event though I hadn't touched it.  Couldn't figure it out for a long time.

Finally, it occurred to me that the icon must be cached somehow.  I tried clearing the application's cache on the phone, but that didn't work.  Then I tried cleaning my application in Eclipse, and that worked.  Just go to Project... / Clean and select your project (or Clean all projects), then next time you compile the app to install on phone, it should be there.

(By the way, for a while I thought maybe I got the size wrong so I was looking for a sizing table.  This is a good page with information on Android icons, but not related to PhoneGap)