Helper.java 文件源码

@ColorInt
public static int setColorAlpha(@ColorInt int color, @FloatRange(from = 0.0D, to = 1.0D) float alpha) {
    int alpha2 = Math.round((float) Color.alpha(color) * alpha);
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    return Color.argb(alpha2, red, green, blue);
}