In this tip, I present the way to import a jar library to Android Project in Android Studio 1.1.0.
To import an external .jar file in your Android Studio Project, just follow the below steps:
Step 1: Move from Android view to Projects view.
Step 2: Now under app folder you should see libs, if you don't see it, create it.
Step 3: Drag & Drop the .jar file here, you may be get a prompt "This file does not belong to the project", just click OK.
Step 4: Now you should see the jar file under libs folder, right click on the jar file and select "Add as library", Click OK for prompt "Create Library".
Some screen shots for details: