Was trying to debug an empty app and got \"\'Resource.Attribute\' does not contain a definition for \'actionBarSize\'\" error. I have reinstalled android SDK\'s.
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I had the same problem (and various more) after create a new .forms project (shared) with VS2015 Update 3 RC.
To the JDK 7, I had installed the version:
Java SE Development Kit Update 55
After I have downloaded and installed
Java SE Development Kit Update 79
from: Download JDK 7 - Update 79
and rebooted my machine
this problem (an various further problems) has gone.