Cannot resolve symbol 'ProductFlavor'

Messages

Cannot resolve symbol 'ProductFlavor'

Description

The Android Studio project can build and run, but got error of 'ProductFlavor'.
This happened when using com.android.build.gradle.internal.dsl.ProductFlavor in gradle files.

Dev env

• macOS 11.6 (Big Sur) x64
• Android Studio Bumblebee Patch 1
• Android SDK version 27
• buildTool: 28.0.3
• Android Gradle Plugin: 3.3.3
• Gradle: 4.10.3
• Gradle JDK: corretto-1.8
• Kotlin: 1.3.72

Tried approaches

• Android Studio 出现“Cannot resolve symbol” 解决办法
  • Invalidate caches / restart
  • sync proj with gradle files.
  • modify dependencies libs version -> sync
  • delete /username/.gradle folder
    => none of the above approaches works for me.
  • comment out dependencies libs -> sync -> uncomment -> sync
    => It works!
• Cannot resolve symbol 'File' in settings.gradle
  • modify jdk version
    => not work for me.
• Update Gradle version
  • update from 4.10.1 to 4.10.3
    => not work for me.
• Update Android Gradle Plugin version
  • update from 3.2.1 to 3.3.3
    => not work for me.
• Remove the type casting to ProductFlavor.
  • When def productFlavor variables, it does not need type casting, still work fine.
    => It works!

Solutions

• comment out dependencies libs -> sync -> uncomment -> sync
  • Comment out import com.android.build.gradle.internal.dsl.ProductFlavor and sync, then uncomment code and sync again. Ta-da! the error just disappear.
• Remove the type casting to ProductFlavor.
  • When def productFlavor variables, it does not need type casting, still work fine.