coloring image

float r = Color.red(obj.color)/255.0f;
float g = Color.green(obj.color)/255.0f;
float b = Color.blue(obj.color)/255.0f;

float[] matrix = {
        r, r, r, r, r, //red
        g, g, g, g, g, //green
        b, b, b, b, b, //blue
        1, 1, 1, 1, 1 //alpha
};

color_paint = new Paint();
color_paint.setAntiAlias(true);
color_paint.setColorFilter(new ColorMatrixColorFilter(matrix));