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Return the opacity/transparency of this Drawable. The returned value is one of the abstract format constants in Android.Graphics.PixelFormat: Android.Graphics.PixelFormat.UNKNOWN, Android.Graphics.PixelFormat.TRANSLUCENT, Android.Graphics.PixelFormat.TRANSPARENT, or Android.Graphics.PixelFormat.OPAQUE.
Generally a Drawable should be as conservative as possible with the value it returns. For example, if it contains multiple child drawables and only shows one of them at a time, if only one of the children is TRANSLUCENT and the others are OPAQUE then TRANSLUCENT should be returned. You can use the method Drawable.ResolveOpacity(int, System.Int32) to perform a standard reduction of two opacities to the appropriate single output.
Note that the returned value does not take into account a custom alpha or color filter that has been applied by the client through the Drawable.SetAlpha(int) or Drawable.SetColorFilter(Android.Graphics.ColorFilter) methods.