When I am working in a new project, occasionally I will run into an issue where R.(insert rest of resource path) Will just stop working. The only work around I have found is to copy the files and place them in a new project. What could possibly cause R not to be found for onCreate?
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Try to clean your project. Go to **AndroidStudio > build > clean Peroject** – Piyush k Sep 27 '16 at 14:20
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try this: Go to File > Invalidate Caches/Restart > Message box appears, click on Invalidate and Restart.

Angela Sanchez
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