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Get a Android.Views.Surface that can be used to produce Android.Media.Image for this ImageReader.
Until valid image data is rendered into this Android.Views.Surface, the ImageReader.AcquireNextImage method will return null. Only one source can be producing data into this Surface at the same time, although the same Android.Views.Surface can be reused with a different API once the first source is disconnected from the Android.Views.Surface.