How to transform hex color into float 0-1?

Question

I need process a hex string value to floating color.

The real color is (in RGBA format)

{ 0.63671875f, 0.76953125f, 0.22265625f, 1.0f }

Is green, when 0 is equivalent to 00 and 1 is FF. But need convert the color to 0-255 decimal to calculate the % from 0 to 255 and set the float value.

How to transform by example #AABBCCFF to float array?

When parsecolor i have the integer value:

Color.parseColor("#AABBCCFF");

But how transform the integer to each color in float? red green blue and alpa

e-info128 · Accepted Answer · 2016-07-19 02:01:19Z

I fount the solution:

private float[] getFloatArrayFromARGB(String argb){ int color_base = Color.parseColor(argb); int red = Color.red(color_base); int green = Color.green(color_base); int blue = Color.blue(color_base); int alpha = Color.alpha(color_base); return new float[]{ (red / 255f), (green / 255f), (blue / 255f), (alpha / 255f) }; }

Use:

String argb = "#FFFF0000"; float[] color = this.getFloatArrayFromARGB(argb); GLES20.glUniform4fv(mColorHandle, 1, color, 0);

:D Now use ARGB format to paint 3D objects with OpenGL

Multiplying and dividing by 100 is not necessary: (((red * 100) / 255) / 100) can be simplified to red / 255f
(((red * 100) / 255) / 100) also uses integer division and thus would only return 0 or 1
Richard, i tested, when divide two integer in Java, the framework transform the result from integer to float automaticaly. The result is parsed by new float[], the result return an array of float values. Thanks for simplify the result deleting the "100".

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