NotificationsPreferenceFragment.java 文件源码

private void initializeRingtoneSummary(RingtonePreference pref) {
  RingtoneSummaryListener listener =
    (RingtoneSummaryListener) pref.getOnPreferenceChangeListener();
  SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());

  listener.onPreferenceChange(pref, sharedPreferences.getString(pref.getKey(), ""));
}