SettingsFragment.java 文件源码

private void emptyAndHidePreferenceScreen(int preferenceKey) {
    Preference preference = findPreference(getString(preferenceKey));
    if (!(preference instanceof PreferenceScreen))
        return;

    PreferenceScreen preferenceScreen = (PreferenceScreen) preference;
    preferenceScreen.removeAll();
    hidePreference(preferenceScreen);
}