Android - Widget with Scrollable Listview Manual Refresh

Question

I googled and found the code to manipulate listview data using RemoteViewsService and RemoteViewsService.RemoteViewsFactory. as below

Answer 1

You can update the ListView by using notifyAppWidgetViewDataChanged() method of AppWidgetManager. You will have to get the instance of AppWidgetManager, get the AppWidgetIds and the call appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, viewId);

Pseudo Code,

AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int appWidgetIds[] = appWidgetManager.getAppWidgetIds(
                           new ComponentName(context, WidgetProvider.class));
appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.listview);

When you call notifyAppWidgetViewDataChanged() then the onDataSetChanged() method of RemoteViewsFactory will be called which is serving as a Adapter for your ListView. You can do web-service stuff and other operations in onDataSetChanged(), get the response and add it to your data-set which maybe ArrayList or any such Collection.

For further readings/reference you can check Keeping Collection Data Fresh part from the docs. Also you can check a demo example from my github.