为什么一张图不放大

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NineGridView(
margin: EdgeInsets.all(12),
padding: EdgeInsets.all(5),
space: 5,
type: NineGridType.qqGp,
itemCount: 1,
itemBuilder: (BuildContext context, int index) {
return Image.network('https://img1.baidu.com/it/u=3676446160,2628100231&fm=26&fmt=auto&gp=0.jpg');
},

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已经解决了. 谢谢.打扰