Settings.java 文件源码

@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
    String stringValue = newValue.toString();
    if (preference instanceof ListPreference) {
        ListPreference listPreference = (ListPreference) preference;
        int prefIndex = listPreference.findIndexOfValue(stringValue);
        if (prefIndex >= 0) {
            CharSequence[] labels = listPreference.getEntries();
            preference.setSummary(labels[prefIndex]);
        }
    }else {
        preference.setSummary(stringValue);
    }
    return true;
}