title: "This file is not part of the project Please include it in the appropiate build file(build.gradle, CMakeLists.txt....)
body: <p>I am new to Android Studio and couldn't solve this problem. I wrote a cpp code with it's header file, but even though I added the cpp file to CMakeLists.txt, I still get this error.</p>
  
  <p>How can I include my cpp file to a build file?</p>