[Android][Resolved] Cannot resolve symbol @string/app_name in AndroidManifest-xml in Android Studio

Check "File" and then Invalidate Caches/ Restart

Select Invalidate and Restart

Then Android Studio will restart and the problem should be disappeared.

Reference:
http://stackoverflow.com/questions/18927972/my-debug-androidmanifest-xml-is-giving-me-cannot-resolve-symbol-errors