why is there content_main.xml and activity_main.xml by default instead of just activity_main.xml?

Question

I have just begun learning Android App development. I have Android Studio 1.4. In my layout folder I have two XML files (content_main.xml and activity_mai

Answer 1

use that one which is set in Activity class. i mean set to setContentView(). or please provide your code if you want more description.