Question

I’m writing a game which has a basic sprite (a balloon) – currently I have 2 different color balloon PNG files which I have created, I need to create more (probably another 5 or so) and don’t want to have like 7 different png files. (that would be 20 extra files as I have 4 different sizes for scaling purposes) I would rather stick to 1 – the ones I have at the moment are yellow and red (almost solid, but not quite – they have details on them).

Question – is there a simple way to alter the colour of my existing PNG files? I’ve seen people mention setColor and setColorFilter but I can’t work out how to use these. Also will these even work on PNG files that already have a colour or do they only work on White PNG files (I don’t think my PNG’s can realistically be just white)?

Thank you all any help would be appreciated.

Answer 1

You can try to define a custom ColorMatrix with random r g b values:

Random rand = new Random();
int r = rand.nextInt(256);
int g = rand.nextInt(256);
int b = rand.nextInt(256);

ColorMatrix cm = new ColorMatrix();
cm.set(new float[] {
                   1, 0, 0, 0, r,
                   0, 1, 0, 0, g,
                   0, 0, 1, 0, b,
                   0, 0, 0, 1, 0 }); // last line is antialias
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(myBitmap, toX, toY, paint);

I hope it helps.