I am already use eclipse mars in fedora 22. I have taken backup eclipse & SDK from fedora 22.Now I update my os to fedora 23. Now I am using the same eclipse and sdk in my updated fedora 23.Now I have face the below errors
R.java not generated Under gen folder Please find screenshot for your easy reference project - hierarchy
Thanks to everyone. I got answer its work for me. R.java can't generate due to "Android SDK is initially intended for 32 bits. As I have 64bit Linux I need to install additional 32bit packages to make it work."
http://fedoraproject.org/wiki/HOWTO_Setup_Android_Development
