How to add copyright to Android-Studio?

File > Settings > Editor > Copyright > Copyright Profiles > + add -> profile name

Sample Copyright Template Text

/**
 * Created by $username on $today
 * Copyright (c) $today.year . All rights reserved.
 * Last modified $file.lastModified
 */

If you need any extra variables, please visit source Copyright Profiles

On the file you want to insert the copyright notice you have to press Alt+Insert for Windows and GNU/Linux or Command+N for Mac and select the copyright to be inserted.

http://www.jetbrains.com/idea/webhelp/generating-and-updating-copyright-notice.html