Positioned控件主要用来设置绝对布局，必须配合Stack控件来使用，

Positioned控件 通过设置left和top属性可以设置控件的绝对位置

 

import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Positioned布局控件',home: Scaffold(appBar: AppBar(title: Text("Flutter Positioned布局控件"),),body: Stack(children: <Widget>[Image.network("http://www.people.com.cn/mediafile/pic/20150119/47/8293839320385270859.jpg"),new Positioned(left: 65,top: 5,child: Text("我的当前位置",style:new TextStyle(color: Colors.red),),),],)));}
}