Course from Caster.io - Custom Views and ViewGroups
The app, Custom Views, uses a custom timer view that counts up and a custom viewgroup to populate a RecyclerView.
To learn how how Android Views and ViewGroups are rendered. And to create custom views.
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Creates a custom ViewGroup by extending the base, and having specific children
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Uses a custom View class in an XML layout
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Requests a custom View class to redraw