Difference between content_main.xml and activity_main.xml?

Question

I am new to Android App development. I have Android Studio 1.4. In my layout folder I have two XML files (content_main.xml and activity_main.xml).

Answer 1

activity_main and content_main are linked to each other.

You can use either both. But to be specific, you should use activity_main.

let me explain this further.

activity_main, this is where the content_main is placed. This is a mother and child case, where activity_main is the mother and content_main is the child.

content_main, this is where you put your controls / content e.g button. This represents as the body of your design.