Easy way to generate ColorStateList

ColorStateGenerator.java

class ColorStateGenerate{
    // 灰度
    public static int greyer(int color) {
        int blue = (color & 0x000000FF) >> 0;
        int green = (color & 0x0000FF00) >> 8;
        int red = (color & 0x00FF0000) >> 16;
        int grey = Math.round(red * 0.299f + green * 0.587f + blue * 0.114f);
        return Color.argb(0xff, grey, grey, grey);
    }

    // 明度
   public static int darker(int color, float ratio) {
        color = (color >> 24) == 0 ? 0x22808080 : color;
        float[] hsv = new float[3];
        Color.colorToHSV(color, hsv);
        hsv[2] *= ratio;
        return Color.HSVToColor(color >> 24, hsv);
    }

    public static ColorStateList csl(int normal, float ratio) {
        //        int disabled = greyer(normal);
        int pressed = darker(normal, ratio);
        int[][] states = new int[][]{{android.R.attr.state_pressed}, {}};
        int[] colors = new int[]{pressed, normal};
        return new ColorStateList(states, colors);
    }
    
    private ColorStateList createColorStateList(int normal, int pressed, int focused, int unable) {
        int[] colors = new int[]{pressed, focused, normal, focused, unable, normal};
        int[][] states = new int[6][];
        states[0] = new int[]{android.R.attr.state_pressed, android.R.attr.state_enabled};
        states[1] = new int[]{android.R.attr.state_enabled, android.R.attr.state_focused};
        states[2] = new int[]{android.R.attr.state_enabled};
        states[3] = new int[]{android.R.attr.state_focused};
        states[4] = new int[]{android.R.attr.state_window_focused};
        states[5] = new int[]{};
        return new ColorStateList(states, colors);
    }
}