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Returns the overlay for this view, creating it if it does not yet exist. Adding drawables to the overlay will cause them to be displayed whenever the view itself is redrawn. Objects in the overlay should be actively managed: remove them when they should not be displayed anymore. The overlay will always have the same size as its host view.
Note: Overlays do not currently work correctly with Android.Views.SurfaceView or Android.Views.TextureView; contents in overlays for these types of views may not display correctly.