SettingsFragmentHelper.java 文件源码

@TargetApi( Build.VERSION_CODES.ICE_CREAM_SANDWICH )
private static void setChecked( PreferenceGroup parent, String preferenceKey, boolean checked ) {
    Preference p = parent.findPreference( preferenceKey );
    if( p instanceof CheckBoxPreference ) {
        ( (CheckBoxPreference) p ).setChecked( checked );
    } else if( Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH ) {
        if( p instanceof TwoStatePreference ) {
            ( (TwoStatePreference) p ).setChecked( checked );
        }
    }
    if( p != null ) {
        p.setDefaultValue( Boolean.valueOf( checked ) );
    }
}