Android Studio 3.1: Erroneous unresolved references in editor

  1. Exit Studio.
  2. Delete .idea/ (seems to me that’s most important), build/, app/build directories.
  3. Start Studio
  4. Set Settings -> Build -> Gradle settings back (last stable Gradle local distribution in my case).
  5. Clean&rebuild project.

Helps me.

Delete {projectDir}/.idea/libraries, then go to File -> Sync Project with Gradle Files.

I had the same problem on Android Studio 3.2.1.

The solution was to use stable ‘com.android.tools.build:gradle:3.2.1’, not alpha…

In the project build.gradle change the version like the code below (or if there is a newer stable version)

dependencies {
  classpath 'com.android.tools.build:gradle:3.2.1'
} 

If this doesn’t solve your problem than in File >> choose Invalidate caches/Restart… and on the next dialog choose Invalidate and Restart

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