ListSummaryPreferenceFragment.java 文件源码

@Override
public boolean onPreferenceChange(Preference preference, Object value) {
  ListPreference listPref   = (ListPreference) preference;
  int            entryIndex = Arrays.asList(listPref.getEntryValues()).indexOf(value);

  listPref.setSummary(entryIndex >= 0 && entryIndex < listPref.getEntries().length
                      ? listPref.getEntries()[entryIndex]
                      : getString(R.string.preferences__led_color_unknown));
  return true;
}