Use fragments when possible

[saik0]

Always use fragments on api > 11.

I do think though that the default library convention will be to "show all prefs at once" when single pane, unless our Extras tell us otherwise or the user overrides this behavior.

[cachapa]

I'm a bit confused by this bug's description.
Do I understand correctly that it's possible to show the headers and preferences separately when on single pane by setting some option?

I wanted to follow the way the Android System Preferences work where on smaller devices you get a single pane but still separate headers and preferences screens.

Is there a way to do this with the current version of the library? I couldn't find anything on the code or here.

[cjuhong]

@cachapa

+1 single pane but still separate headers and preferences screens