ring-android/app/src/main/res/xml/preferences.xml

<?xml version="1.0" encoding="utf-8"?><!--
Copyright (c) 2016 Savoir-faire Linux Inc.

Author: Adrien Beraud <adrien.beraud@savoirfairelinux.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->
<android.support.v7.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.v7.preference.PreferenceCategory android:title="@string/pref_category_network">
        <android.support.v14.preference.SwitchPreference
            android:defaultValue="false"
            android:icon="@drawable/ic_perm_data_setting_black_24dp"
            android:key="@string/pref_mobileData_key"
            android:summary="@string/pref_mobileData_summary"
            android:title="@string/pref_mobileData_title" />
    </android.support.v7.preference.PreferenceCategory>

    <android.support.v7.preference.PreferenceCategory android:title="@string/pref_category_contacts">
        <android.support.v14.preference.SwitchPreference
            android:defaultValue="true"
            android:icon="@drawable/ic_group_black_24dp"
            android:key="@string/pref_systemContacts_key"
            android:summary="@string/pref_systemContacts_summary"
            android:title="@string/pref_systemContacts_title" />

    </android.support.v7.preference.PreferenceCategory>
    <android.support.v7.preference.PreferenceCategory android:title="@string/pref_category_system">

        <android.support.v14.preference.SwitchPreference
            android:defaultValue="false"
            android:icon="@drawable/ic_dialpad_black_24dp"
            android:key="@string/pref_systemDialer_key"
            android:summary="@string/pref_systemDialer_summary"
            android:title="@string/pref_systemDialer_title" />


        <android.support.v14.preference.SwitchPreference
            android:defaultValue="true"
            android:icon="@drawable/ic_android_black_24dp"
            android:key="@string/pref_startOnBoot_key"
            android:summary="@string/pref_startOnBoot_summary"
            android:title="@string/pref_startOnBoot_title" />

    </android.support.v7.preference.PreferenceCategory>

</android.support.v7.preference.PreferenceScreen>