Style attribute attr/colorSecondary not found

Question

I can\'t build my project. It shows me attr/colorSecondary not found error.

These are my styles and manifest files:

Android studi

Answer 1

You need to explicitly define the 'attr' type in the item in AS 3.0

eg.

@color/primaryColor

Docs: https://web.archive.org/web/20180518223123/https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration

Also, don't forget to define the attribute in your attrs.xml. eg.