您可以为不同尺寸的设备使用纵横比。

Container(
      color: Colors.blue,
      alignment: Alignment.center,
      width: double.infinity,
      height: 100.0,
      child: AspectRatio(
        aspectRatio: 16 / 9,
        child: Container(
          color: Colors.green,
        ),
      ),
    );

您也可以使用媒体查询来获取设备的高度和宽度，以便轻松修改UI

@override
  Widget build(BuildContext context) {
     
    // getting the size of the window
    size = MediaQuery.of(context).size;
    height = size.height;
    width = size.width;
 
    return Scaffold(
      appBar: AppBar(
        title: Text("Geeks For Geeks"),
        backgroundColor: Colors.green,
      ),
      body: Container(
        color: Colors.yellow,
        height: height/2,//half of the height size
        width: width/2,//half of the width size
      ),
    );
  }