DictionarySettingsFragment.java 文件源码

private WordListPreference findWordListPreference(final String id) {
    final PreferenceGroup prefScreen = getPreferenceScreen();
    if (null == prefScreen) {
        Log.e(TAG, "Could not find the preference group");
        return null;
    }
    for (int i = prefScreen.getPreferenceCount() - 1; i >= 0; --i) {
        final Preference pref = prefScreen.getPreference(i);
        if (pref instanceof WordListPreference) {
            final WordListPreference wlPref = (WordListPreference)pref;
            if (id.equals(wlPref.mWordlistId)) {
                return wlPref;
            }
        }
    }
    Log.e(TAG, "Could not find the preference for a word list id " + id);
    return null;
}