SettingsActivity.java 文件源码

@Override
public boolean onPreferenceChange(Preference preference, Object value) {
    if (preference instanceof MultiSelectListPreference) {
        MultiSelectListPreference multiListPreference =
                (MultiSelectListPreference) preference;

        int accountCount = multiListPreference.getEntries().length;
        int selectedCount = ((Set<String>) value).size();

        preference.setSummary(preference.getContext().getString(
                R.string.pref_summary_accounts, selectedCount, accountCount));

    } else {
        preference.setSummary(value.toString());
    }
    return true;
}