title: How to add external library in IntelliJ IDEA?
body: <p>I am trying to add external library (places it in the /libs directory) to my project. When I try to use the methods from that library, I see that they are in red color which means that the library is not recognized. When I click Ctrl+B, I get a message "Cannot find declaration to go to".</p>
  
  <p>I use these steps to add a library (JAR file):
  1. copy the library file into /libs dir
  2. open Project Structure -> Global Libraries -> Attach clases
  3. find the library and click ok</p>
  
  <p>Is this proper way to do it?</p>
  
  <p>PS. I am trying to add AdMob .jar file this way. </p>