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After upgrading to Android Studio my styles.xml suddenly has lots of errors.

Theme... is no longer recognized

When trying to change the parent property Android Studio suggests 'TextAppearance.Widget.AppCompat.Toolbar' as a valid value when typing...

Also I had to prefix ?attr/... attributes with ?android:attr like below...

android:background="?android:attr/selectableItemBackground"

Note that my app will compile and run...

Are these bugs? (probably...)

If not; What is the reason for the change?

If so; What prefix is missing for my themes?

Thanks, Ove

Ove Stoerholt
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2 Answers2

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I get that from time to time as well, I usually try the following:

  • Clean & Rebuild Project
  • Sync project with Gradle files
  • File -> Invalidate caches / Restart -> Invalidate and Restart

A combination of these in a random order usually solves it (I know, I know, really scientific method... but hey as long as it works :))

patrick.elmquist
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It can be solved after Sync project with Gradle, Clean , Rebuild the Project. I think it is a bug of android studio 3.0.

Nipuna Rajapaksha
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