In part 6 of the app widget tutorial, we will learn how to update adapter-based collection widgets. For this we have to call notifyAppWidgetViewDataChanged on the AppWidgetManager, which then triggers the onDataSetChanged method in the RemoteViewsFactory class in the RemoteViewsService. In this method we can do long running operations like database and network calls synchronously, because we will just see a loading view while the data is being fetched.

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