Here’s the thing. When showing a preference view in a new Activity and loading the XML preference layout within a Fragment, the problem is when you call addPreferencesFromResource(), the Fragment shows a blank view.
No Exceptions, no warnings. Nada.
I have no idea why, but calling getSupportActionBar() solves this problem. Without calling the action bar method, android.R.id.content does not seem to exist hence replacing it with a Fragment will result in nothing since there is nothing to replace in the first place.