Android : How to load preview image in AppWidgetProviderInfo

I googled but can not solve my problem, i think you guys can help me..

So.. I need load the preview image of AppWidgetProviderInfo class.

I see in oficial documentation here, has a method to load it, but only API level 21+, and i need this for older version.

Some code here to help..

AppWidgetProviderInfo widgetProviderInfo
...
widgetProviderInfo.previewImage; // It's return an int(id from the resource i think).

I've tried several ways, but nothing work..

Any ideas how i can load this resource?

Thanks!