SettingsFragment.java 文件源码

/**
 * Handles setting the summary after an new selection has been made
 *
 * @param key of the setting to update its summary for
 */
private void setSummary(String key) {
    final Preference preference = findPreference(key);

    if (preference != null) {
        Bundle extras = preference.getExtras();

        final String defaultValue = extras.getString("default");

        final String value = PreferenceManager
                .getDefaultSharedPreferences(mContext).getString(key, defaultValue);

        preference.setSummary(value);
    }
}