SettingsActivity.java 文件源码

@Override
public boolean onPreferenceChange(Preference preference, Object value) {
    String stringValue = value.toString();

    if (preference instanceof MultiSelectListPreference) {
        // For multi select list preferences we should show a list of the selected options
        MultiSelectListPreference listPreference = (MultiSelectListPreference) preference;
        CharSequence[] values = listPreference.getEntries();
        StringBuilder options = new StringBuilder();
        for(String stream : (HashSet<String>) value) {
            int index = listPreference.findIndexOfValue(stream);
            if (index >= 0) {
                if (options.length() != 0) {
                    options.append(", ");
                }
                options.append(values[index]);
            }
        }

        preference.setSummary(options);
    } else {
        // For all other preferences, set the summary to the value's
        // simple string representation.
        preference.setSummary(stringValue);
    }
    return true;
}