I’m new in Android Development so I got (I think so) an epic easy problem to solve but I still can’t do it..
How may I delete a .xml file from my Droid Project?
I’m trying to simple press “Delete” to do it but I receive an error that says:

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It seems like aapt may have failed and left eclipse in a weird state. Make sure calc_auto.xml doesn’t have any errors in it. If it does, make sure you fix them, especially, as suggested here, any errors with the xmlns:android attribute.
If you still can’t delete it after that, this post mentions that after fixing the XML file, you can try opening up the Problems view (Window->Show View->Problems on a Mac) and deleting the error. Then modify a few files and try running it to force a rebuild.
Eclipse with ADT is a great tool, but can sometimes end up in weird states, especially when aapt is parsing through your resources.