How to show a preference at center of the screen?

Question

I am creating an android project. I am using PreferenceCategory in my PreferenceScreen. My layout for PreferenceScreen looks like this.

<PreferenceCategory app:title="ABC"
        app:key="P1"
        />
<PreferenceCategory app:title="ABC"
        app:key="P2"
        />
<PreferenceCategory app:title="ABC"
        app:key="P3"
        />
<PreferenceCategory app:title="ABC"
        app:key="P4"
        />
<PreferenceCategory app:title="ABC"
        app:key="P5"
        />

In PreferenceCategory P2 and P3 I am adding Preferences using addPreference() function. What I want is to show PreferenceCategory P4 and P5 in centre(horizontally and vertically) of remaining screen.

I searched on internet about this but didn't find any gravity related attribute for PreferenceCategory. Is there any way to achieve this?