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Get method documentation [Android Documentation]
Returns the alpha represented by the Outline.
Set method documentation [Android Documentation]
Sets the alpha represented by the Outline - the degree to which the
producer is guaranteed to be opaque over the Outline's shape.
An alpha value of 0.0f either represents completely
transparent content, or content that isn't guaranteed to fill the shape
it publishes.
Content producing a fully opaque (alpha = 1.0f) outline is
assumed by the drawing system to fully cover content beneath it,
meaning content beneath may be optimized away.