Cleaning project broke R

I had some problems with R in one of my Android projects, so I tried Eclipse->Project->Clean. I foolishly did it for all of my projects (what's the harm, right?). Now Eclipse throws a warning for every last reference to R, and refuses to build anything. Build All does not do anything. Help please!

EDIT: I just noticed that this is similar to: Link Clean in Eclipse temporarily destroys Android project with error message: missing required source folder: 'gen'

Perhaps for those that fiddling with Build Automatically does not help, the above will help.

I did not get this particular error message, though.


Reopen Eclipse helps me in such issue, or you can try to uncheck and check again Build Automatically.

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