I am a native android and ios developer with a bit of Unity experience. Is it possible to build my game menus and other parts of the app with native platform views and only show the Unity game as a subview on a native view?
I don't think you could achieve this. Unity runs full screen on the device. With some care some of the native elements can be brought over Unity but its not often worth the effort.
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I don't think you could achieve this. Unity runs full screen on the device. With some care some of the native elements can be brought over Unity but its not often worth the effort.