如何在运行时获取铃声首选项？

i have the following xml:

我有以下xml:

 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="https://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="Ringtone preference" android:key="ringtone_option_preference">
    <RingtonePreference 
    android:key="ring_tone_pref"
    android:title="Set Ringtone Preference"
    android:showSilent="true"
    android:ringtoneType="notification"
    android:summary="Set Ringtone"/>
 </PreferenceScreen>
 <?xml v