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Get method documentation [Android Documentation]
Helper to getColor() that just returns the color's alpha value. This is
the same as calling getColor() >>> 24. It always returns a value between
0 (completely transparent) and 255 (completely opaque).
Set method documentation [Android Documentation]
Helper to setColor(), that only assigns the color's alpha value,
leaving its r,g,b values unchanged. Results are undefined if the alpha
value is outside of the range [0..255]