In part 4 of the app widget tutorial, we will learn how to implement adapter-based views into our home screen widget.
For this we can use a ListView, GridView, AdapterViewFlipper or a StackView.
Since the app widget is in another process, we have to use a RemoteViewsService that returns RemoteViewsFactory objects in it's onGetViewFactory method as a replacement for a normal adapter. In this class we have to implement onCreate, onDestroy, onDataSetChanged, getCount, getViewAt, getLoadingView, getViewTypeCount, getItemId and hasStableIds, which are similar to the methods of the normal adapter interface.
We set this adapter on our widget with setRemoteAdapter and can additionaly define an empty view that will be displayed if our data set is empty with setEmptyView.
In our manifest file we register our RemoteViewsService with the BIND_REMOTEVIEWS permission that can only be held by the Android system.
With autoAdvanceViewId we can flip through our StackView automatically and with loopViews we can make it restart at card 1 after reaching the last card in the stack.

Watch the whole playlist:
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Example code for this part:
https://gist.github.com/codinginflow/2d6a23eb66484bdc3cd6f6067174e630

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