SettingsFragment.java 文件源码

private void emptyAndHidePreference(int preferenceKey) {
    Preference preference = findPreference(getString(preferenceKey));
    if (preference instanceof PreferenceCategory)
        emptyAndHidePreferenceCategory(preferenceKey);
    else if (preference instanceof PreferenceScreen)
        emptyAndHidePreferenceScreen(preferenceKey);
}