Custom PreferenceCategory Headings

Question

I have a simple preference screen defined like this

Answer 1

@inazaruk gave the answer well enough but since the recent updates, ADT 18 and above, there are some restrictions on the styles giving the error

Error retrieving parent for item: No resource found that matches the given name '@android:style/Widget.TextView.ListSeparator'.

See this link for reason of the problem and the solution. Since this post doesn't provide a code for understanding i am providing my code here