Cannot resolve 'R' symbol

My Android app prompt for error - cannot resolve symbol 'R'. Already restart Android, clean and rebuild the project but doesn't help. Any idea ?

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AXISHKAsked:
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Chris Harte2015 Top Expert (Most Article Points)Commented:
In order try:
Clean and rebuild.
Gradle sync.
From the menu File->Invalidate Caches/Restart
Close and reopen project.

If all that fails then this is probably a problem with your resource files, in particular your layouts. Look at the source rather than the design view and see if there are any problems.
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AXISHKAuthor Commented:
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