Android Studio can't see imports

Question

I've just built my project in Android Studio and now it doesn't see my imports in MainActivity class. It worked before. These classes that I want to import are in the library folder. Do I need to change something in the Gradle files?

Error:

Cannot resolve symbol 'TSChannel'.

Answer 1

As it says here You should insert the jar, right click and select Add As Library... and Check it in build.gradle.