flutter - 如何将容器的不透明度放在 flutter 中

Question

我想为包含十六进制颜色代码的容器设置不透明度。我是新来的。请帮我。这是代码。提前致谢。

final body = Container(
  width: MediaQuery.of(context).size.width,

  margin: const EdgeInsets.only(left: 40.0, right: 40.0),
  padding: EdgeInsets.all(28.0),
   decoration: new BoxDecoration(
     color:   const Color(0xFF0E3311),//here i want to add opacity

   border: new Border.all(color: Colors.black54,
   ),
       borderRadius: new BorderRadius.only(
           topLeft: const Radius.circular(40.0),
           topRight: const Radius.circular(40.0),
       bottomLeft: const Radius.circular(40.0),
       bottomRight:const Radius.circular(40.0) )
),

  child: Column(
    children: <Widget>[ email, password,loginButton],
  ),
);

Answer 1

换行

const Color(0xFF0E3311)

到

const Color(0xFF0E3311).withOpacity(0.5)

或任何你想要的值。