PreferenceActivity.java 文件源码

/**
 * Sets the summary of the preference according to its value
 *
 * @param preference
 * @param value
 */
private static void setPreferenceSummaryByValue(Preference preference, Object value) {
    String stringValue = value.toString();

    if (preference instanceof ListPreference) {
        // For list preferences, look up the correct display value in
        // the preference's 'entries' list.
        ListPreference listPreference = (ListPreference) preference;
        int index = listPreference.findIndexOfValue(stringValue);

        // Set the summary to reflect the new value.
        preference.setSummary(
                index >= 0
                        ? listPreference.getEntries()[index]
                        : null);
    }
    else {
        // For all other preferences, set the summary to the value's
        // simple string representation.
        preference.setSummary(stringValue);
    }
}