SettingsFragment.java 文件源码

@Override
public boolean onPreferenceChange(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 if (preference instanceof CheckBoxPreference) {
        // Intentionally left blank.
    } else if (!(Integer.parseInt(value.toString()) < MAX_VALUE_ID)) {
        Toast.makeText(getActivity(), "Please enter a value between 0 - " + MAX_VALUE_ID, Toast.LENGTH_LONG).show();
        return false;
    } else preference.setSummary(stringValue);
    return true;
}