Flutter 设置背景图片

Scaffold(
      body: Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage("images/bg.jpg"),
            fit: BoxFit.cover,
          ),
        ),
        child: Center(
          child: Text('Hello Wolrd', style: TextStyle(fontSize: 22.0, color: Colors.white),),
        ),
      ),
);