Flutter 如何监控横竖屏切换 ？

Flutter 如何监控横竖屏切换 ？针对横竖屏，提供对应的页面布局

 a widget called OrientationBuilder

OrientationBuilder is a widget 
which builds a layout or part of a layout 
on an orientation change.

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(),
    body: OrientationBuilder(
      builder: (context, orientation) {
        return orientation == Orientation.portrait
            ? _buildVerticalLayout()
            : _buildHorizontalLayout();
      },
    ),
  );
}

The OrientationBuilder has a builder function to build our layout. 
The builder function is called when the orientation changes. 
屏幕横竖屏切换的时候会进行回调
The possible values being Orientation.portrait or Orientation.landscape.

检查目前横竖屏状态 ：

MediaQuery.of(context).orientation

MediaQuery.of(context).orientation == Orientation.landscape

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