Cannot Resolve R after update

Issue

I just updated Android studio and every java file now has a cannot resolve R error.

I have tried rebuilding and cleaning the project nothing has fixed it.

I am not sure what code to show you all since I didn't change any since the update...

Solution

First of all you have to restart Android Studio. Believe me a lot of Eclipse and Android Studio un-logical issues can be solved by restarting the IDE.

Second, the IDE will not be able to successfully build the project and correctly import R if there is any problem in your .XML files. So, if you cannot determine the problem from the error window in the IDE. Then you have to quickly go through your .XML files.

Third, make sure you are not coping into your application resources a file with un-acceptable naming. Such as:

-Image name starting with number.

-Image name contains "-".

-Image name with spaces...etc.

Answered By - Sami Eltamawy