Container

// Container
class ContainerWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Container(
      // 约束
      constraints: BoxConstraints.expand(
        height: Theme.of(context).textTheme.display1.fontSize * 1.1 + 200.0,
      ),
      // 内边距
      padding: const EdgeInsets.all(8.0),
      // 背景色，color与decoration不能同时设置
//      color: Colors.teal.shade700,
      // 对齐
      alignment: Alignment.topLeft,
      // 子视图
      child: Text('百度百77777777',
          style: Theme.of(context)
              .textTheme.display1.copyWith(color: Colors.white, fontSize: 12.0)),
      // 背景装饰
      decoration: BoxDecoration(
        image: DecorationImage(
          image: NetworkImage('https://upload.jianshu.io/admin_banners/'
              'web_images/4592/2cbadf9347d69cfc140daf64de887fda0e361bcc.jpg?'
              'imageMogr2/auto-orient/strip|imageView2/1/w/1250/h/540'),
          centerSlice: Rect.fromLTRB(270.0, 180.0, 1360.0, 730.0),
        ),
      ),
      // 前景装饰
//      foregroundDecoration: BoxDecoration(
//        image: DecorationImage(
//          image: NetworkImage('https://upload.jianshu.io/admin_banners/'
//              'web_images/4592/2cbadf9347d69cfc140daf64de887fda0e361bcc.jpg?'
//              'imageMogr2/auto-orient/strip|imageView2/1/w/1250/h/540'),
//          centerSlice: Rect.fromLTRB(270.0, 180.0, 1360.0, 730.0),
//        ),
//      ),
      // 旋转
//      transform: Matrix4.rotationZ(-0.5),
    );
  }
}

效果：

Simulator Screen Shot - iPhone XS - 2019-01-17 at 10.28.01.png