ToolbarMenuItem.java 文件源码

public static Drawable convertDrawableToGrayScale(Drawable drawable, int color) {
    if (drawable == null || drawable.getConstantState() == null)
        return null;
    Drawable res = drawable.getConstantState().newDrawable().mutate();
    res.setColorFilter(color, PorterDuff.Mode.SRC_IN);
    return res;
}