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Asked: 2026-05-26T16:13:55+00:00

Let’s supposed we’ve got a ring with inner radius R2 and outer radius R1.

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Let’s supposed we’ve got a ring with inner radius R2 and outer radius R1. According documentation:
Inner radius of the ring expressed as a ratio of the ring's width.For instance, if innerRadiusRatio=9, then the inner radius equals the ring's width divided by 9
As I understand this means that innerRadiusRatio = 2*R1 / R2.

About thicknessRatio there is that:
Thickness of the ring expressed as a ratio of the ring's width. For instance, if thicknessRatio=3, then the thickness equals the ring's width divided by 3. So thicknessRatio = 2*R1 / (R1 - R2).

From this two equationі we can get this one: thicknessRatio*(1-2/innerRadiusRatio)=2 which means that there is a connection between thicknessRatio and innerRadiusRatio. But there is nothing about this connection in GradientDrawable class documentation. And it doesn’t seem that there is any connections between them as I can set thicknessRatio and innerRadiusRatio which doesn’t satisfying last equation.

So tell me please where I’m wrong in my consideration or what are this parameters really responsible for?

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1 Answer

  1. Editorial Team

    Ratios are a comparison of two numbers, so the above two equations can be rewritten as

    Ratio1 = InnerRadius : Ring Width (where Ratio1 = InnerRadiusRatio)

    Ratio2 = Thickness : Ring Width (where Ratio2 = ThicknessRatio)

    Which means…

    Ring Width = Ratio1 x Inner Radius = Ratio2 x Thickness

    The “2” appeared since you added it into your equation. The only common denominator in all equation is “Ring Width”. Trying it out with real numbers helps too.

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