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Returns an adapter that can be attached to a Android.Preferences.PreferenceActivity or Android.Preferences.PreferenceFragment to show the preferences contained in this Android.Preferences.PreferenceScreen.
This Android.Preferences.PreferenceScreen will NOT appear in the returned adapter, instead it appears in the hierarchy above this Android.Preferences.PreferenceScreen.
This adapter's Android.Widget.Adapter.getItem(int) should always return a subclass of Android.Preferences.Preference.