flutter-layout

Container

void main() {
  runApp(
    Container(
      width: 100,
      height: 100,
      padding: EdgeInsets.all(20),
      child: Image.network('https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1561692417&di=784f145ad23572c65f02980d1e295b7a&src=http://i0.hdslb.com/bfs/article/22b798834ec1348ff92467f6c16f797194e50759.jpg'),
    )
  );
}

Center

void main() {
  runApp(
   Center(
      child: Text('Center 布局单组件',textDirection: TextDirection.ltr,),
    )
  );
}