Converting a String to hex for use as canvas paint color Java

Question

void changeColor(int a, int r, int g, int b){
    String hex = + Integer.toHexString(a) + Integer.toHexString(r) +
                   Integer.toHexString(g) + Integer.toHexString(b);

    int color = hex //Obviously this is a type mismatch, but how do I do this?

    mpaint.setColor(color);
}

Obviously this is a type mismatch, but how do I do this?

possible duplicate of Convert a string representation of a hex dump to a byte array using Java? — Bozho
– Bozho, Commented Jan 3, 2012 at 22:54

fury · Accepted Answer · 2012-01-03 22:54:59Z

1

If you need a Color variable, you can use the Color contructor (but have to change the range to 0.0-1.0)

Color(float r, float g, float b, float a)

But if you need an int in the end, you have to use bitshifts (this is an example, you have to know how the color components need to be ordered) :

int color = (r << 24) | (g << 16) | (b << 8) | a;

answered Jan 3, 2012 at 22:54

fury

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1 Comment

charles horvath Over a year ago

Actually I found out that the Android SDK for the paint object has a built in color setter in the same format. mpaint.setARGB(a, r, g, b);

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