flutter的布局和widgets

1、column flutter布局-1-column 2、row flutter布局-2-row

3、center flutter布局-3-center

4、flutter布局-4-container

5、flutter布局-5-Matrix4矩阵变换

6、flutter布局-6-MaterialApp

7、flutter布局-7-About对话框

8、flutter布局-8-animated_icons动画图片

9、flutter布局-9-appbar导航栏和状态栏

10、flutter布局-10-SliverAppBar 随内容一起滑动的头部

runApp BuildContext StatefulWidget State EdgeInsets RandomContainer InheritedWidget 继承自ProxyWidget，又继承自 Widget

StreamBuilder StreamController Stream Sink