Cannot resolve symbol '?attr/actionBarSize' after updating Android Studio from 2.3 to 3.0 for buildToolsVersion '26.0.2'

Question

After updating Android Studio from 2.3 to 3.0 I changed buildToolsVersion from 26.0.0 to 26.0.2 and after then I am getting this error:

Cannot reso         


        

Answer 1

This is what I did to fix exactly the same problem. 1. Go to SDK manager. 2. Check Android API 27 and Android 8.0 (Oreo) 3. Click "Apply" to download and install those SDKs 4. In build.gradle, change the 'buildToolsVersion "26.0.1"' to 'buildToolsVersion "26.0.2"' and do a gradle sync.

Hope this can help fix your issue.