PixelDroid-App-Android/app/src/main/res/xml/root_preferences.xml

<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory app:title="@string/theme_header">
        <ListPreference
            app:defaultValue="default"
            app:entries="@array/theme_entries"
            app:entryValues="@array/theme_values"
            app:key="theme"
            app:title="@string/theme_title"
            app:useSimpleSummaryProvider="true" />
    </PreferenceCategory>

    <Preference android:title="@string/about"
        android:key="about"
        android:summary="@string/about_pixeldroid">
        <intent
            android:targetPackage="com.h.pixeldroid"
            android:targetClass="com.h.pixeldroid.AboutActivity"/>
    </Preference>
</PreferenceScreen>