R.java disappears after project clean

Question

After I added some .png files into my Project Workspace drawable folder I refreshed my drawable folders in Eclipse and the newly added files showed up. But when I tried to a

Answer 1

I read and tried many of the above after simply doing a clean on one project. Eclipse would not build anything afterwards.

Fortunately I had last-nights backup of the workspace and my source is copied in from VS 2010.

No more cleaning!