Android tutorial error: R cannot be resolved to a variable

Question

http://developer.android.com/training/basics/firstapp/building-ui.html

I have been following this tutorial, but I have two errors, both \"R cannot be resolved to a v

Answer 1

You have to make sure to

1. Clean your project Project-->Clean
2. The /res directory doesn't contain errors (some files will show up with a red icon on the file explorer)
3. Your imports doesn't contain this line import android.R;
4. Check that in AndroidManifest.xml, the attribute package has the correct value.