android color between two colors, based on percentage?

Question

I would like to calculate the color depending on a percentage value:

float percentage = x/total;
int color;
if (percentage >= 0.95) {
  color = Color.GREE         


        

Answer 1

Here are 2 ways to interpolate:

private static float interpolate(final float a, final float b, final float proportion) {
    return a + (b - a) * proportion;
}

/** Returns an interpoloated color, between a and b */
public static int interpolateColorHsv(final int a, final int b, final float proportion) {
    final float[] hsva = new float[3];
    final float[] hsvb = new float[3];
    Color.colorToHSV(a, hsva);
    Color.colorToHSV(b, hsvb);
    for (int i = 0; i < 3; ++i) {
        hsvb[i] = interpolate(hsva[i], hsvb[i], proportion);
    }
    return Color.HSVToColor(hsvb);
}

public static int interpolateRGB(final int colorA, final int colorB, final float bAmount) {
    final float aAmount = 1.0f - bAmount;
    final int red = (int) (Color.red(colorA) * aAmount + Color.red(colorB) * bAmount);
    final int green = (int) (Color.green(colorA) * aAmount + Color.green(colorB) * bAmount);
    final int blue = (int) (Color.blue(colorA) * aAmount + Color.blue(colorB) * bAmount);
    return Color.rgb(red, green, blue);
}