Android ADT version 22, R.java files not generated
I had the same problem just solved it.
check:Java/Eclipse - No more R file ever
More info:https://groups.google.com/forum/?fromgroups=#!topic/android-developers/rCaeT3qckoE%5B1-25-false%5D
Update Android SDK Tools and Android SDK Platform-tools and Android SDK Build-tools from Android SDK Manager
Add abover dir to your ENV $PATH
Not enough credits (yet :-) ) to vote up or comment directly on Rany A. Ishak's answer, but after one day lost trying to fix these silly problems, I'm very confident I've found the right solution...I'm installing Android SDK Build-tools right now, I'll get back soon on this!