Apps R cannot be resolved to a variable

[Zarin]

Hi My project was working good till few minutes back. Suddenly got error in MainActivity.java as R cannot be resolved to a variable.

I cleaned my project.

Checked my xml files.

And did all, what are all said as solution while searched in google.

But error was not cleared. Can anyone please help me?

 

[Renji]

did u checked on all the xml files.