Quelle  preference_appearance.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:key="pref_key_appearance"
    android:title="@string/prefs_header_appearance"
    android:persistent="true">

    <PreferenceCategory
        android:title="@string/prefs_header_appearance"
        android:key="pref_key_appearance_cat">

        <DropDownPreference
            android:key="@string/preferences__theme"
            android:title="@string/prefs_theme"
            android:icon="@drawable/ic_palette_outline"
            android:entries="@array/list_theme"
            android:entryValues="@array/list_theme_values"
            android:defaultValue="" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:key="@string/preferences__dynamic_color"
            android:title="@string/prefs_dynamic_colors"
            android:summary="@string/prefs_dynamic_colors_sum"
            android:defaultValue="false" />

        <DropDownPreference
            android:key="@string/preferences__app_language"
            android:title="@string/prefs_language_override"
            android:icon="@drawable/ic_language_outline"
            android:entries="@array/list_app_languages"
            android:entryValues="@array/list_app_languages_values"
            android:defaultValue="" />

        <DropDownPreference
            android:key="@string/preferences__emoji_style"
            android:title="@string/prefs_emoji_style"
            android:icon="@drawable/ic_tag_faces_outline"
            android:entries="@array/list_emoji_style"
            android:entryValues="@array/list_emoji_style_values"
            android:defaultValue="0" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:key="@string/preferences__bigger_single_emojis"
            android:title="@string/prefs_bigger_single_emojis"
            android:defaultValue="true" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:key="@string/preferences__default_contact_picture_colored"
            android:title="@string/prefs_default_contact_picture_colored"
            android:summaryOn="@string/prefs_sum_default_contact_picture_colored_on"
            android:summaryOff="@string/prefs_sum_default_contact_picture_colored_off"
            android:defaultValue="true" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:defaultValue="true"
            android:key="@string/preferences__receive_profilepics"
            android:summaryOff="@string/prefs_sum_receive_profilepics_off"
            android:summaryOn="@string/prefs_sum_receive_profilepics_on"
            android:icon="@drawable/ic_outline_account_circle_24"
            android:title="@string/prefs_title_receive_profilepics" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:defaultValue="true"
            android:key="@string/preferences__show_unread_badge"
            android:summary="@string/prefs_sum_show_unread_badge"
            android:title="@string/prefs_title_show_unread_badge" />

    </PreferenceCategory>

    <PreferenceCategory
        android:title="@string/prefs_header_chat"
        android:key="pref_key_chat_app">

        <Preference
            android:key="@string/preferences__wallpaper"
            android:icon="@drawable/ic_wallpaper_outline"
            android:title="@string/prefs_title_wallpaper_switch" />

        <DropDownPreference
            android:key="@string/preferences__fontstyle"
            android:title="@string/prefs_title_fontsize"
            android:icon="@drawable/ic_format_size_outline"
            android:entries="@array/list_fontstyle"
            android:entryValues="@array/list_fontstyle_values"
            app:useSimpleSummaryProvider="true"
            android:defaultValue="0" />

    </PreferenceCategory>

    <PreferenceCategory
        android:title="@string/prefs_contact_list_title"
        android:key="pref_key_contact_list_cat">

        <DropDownPreference
            android:key="@string/preferences__contact_sorting"
            app:useSimpleSummaryProvider="true"
            android:icon="@drawable/ic_sort_by_alpha_outline"
            android:title="@string/prefs_contact_soring"
            android:entries="@array/list_contact_sorting"
            android:entryValues="@array/list_contact_sorting_values"
            android:defaultValue="@string/contact_sorting__last_name" />

        <DropDownPreference
            android:key="@string/preferences__contact_format"
            app:useSimpleSummaryProvider="true"
            android:title="@string/prefs_contact_format"
            android:entries="@array/list_contact_format"
            android:entryValues="@array/list_contact_format_values"
            android:defaultValue="@string/contact_format__first_name_last_name" />

        <CheckBoxPreference
            android:widgetLayout="@layout/preference_switch_layout"
            android:key="@string/preferences__show_inactive_contacts"
            android:title="@string/prefs_show_inactive_contacts"
            android:summaryOn="@string/prefs_sum_show_inactive_contacts_on"
            android:summaryOff="@string/prefs_sum_show_inactive_contacts_off"
            android:defaultValue="false" />

    </PreferenceCategory>
</PreferenceScreen>