Android Studio “cannot resolve symbol” but project compiles and works

Question

The project compiles fine. However, Android studio 3.0.1 shows reference to one particular library in red and displays \"cannot resolve symbol\". Even single stepping into

Answer 1

In my case changing the Gradle version worked.

In gradle-wrapper.properties

changing

distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip

to

distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

and in build.gradle (project level)

changing

classpath 'com.android.tools.build:gradle:3.3.0'

to

classpath 'com.android.tools.build:gradle:3.2.1'