Android Studio 3.0 cannot resolve symbol Theme

Question

As stated in style.xml, there is a weird error, which shows Cannot resolve symbol \'Theme\', which is quite strange.

See pic of the error :-

My Project Spe

Answer 1

Simplest Solution

• Close project
• Import/Reopen project again (Open from directory)

Answer 2

Another possible reason is: Google's maven repository is not set for the build script.

Open your project's main build.gradle add this line:

buildscript {
    repositories {
        google()  <-- this
        // Be also sure that google() is before jcenter()
    }
}

Without this, it may not be able to download the Android Studio Gradle plugin 3.0+. It's not distributed in jCenter but in the Google's maven repository.

Answer 3

It seems to be a setting update of "injected references". Search this word in settings dialog and change its "Severity" option to a different value and apply, then change back to its original choice. The error highlight in the editor then disappears.

Answer 4

Delete 'com.android.support:appcompat-v7:27.0.0','com.android.support:design:27.0.0' compile from app build.gradle then sync and then again paste those 2 compile then sync.... it will solve

Answer 5

In my case, Invalidate Caches/Restart worked fine for me.

Answer 6

Close the project and import it again. Worked for me today.