Readerme

new Center(
 child: new Object_3D(
 size: const Size(400.0, 400.0),
  path: "assets/NVpose1.obj",
 asset:
 true), //assets/file.obj为我们的本地obj文件，需要到pubspec.yaml中进行配置
),
  showDemoDialog<String>(
                                          context: context,
                                          child: new SimpleDialog(
                                            contentPadding: EdgeInsets.all(0.0),
                                            titlePadding: new EdgeInsets.only(
                                                left: 0.0, bottom: 0.0),
                                            title: new Container(
                                                padding:
                                                    new EdgeInsets.all(10.0),
                                                color: Color(0xFF00E5FF),
                                                child: new Row(
                                                  mainAxisAlignment:
                                                      MainAxisAlignment
                                                          .spaceBetween,
                                                  children: <Widget>[
                                                    Text(
                                                      '去购物',
                                                      style: TextStyle(
                                                          color:
                                                              Colors.redAccent),
                                                    ),
                                                    IconButton(
                                                      icon: Icon(Icons.clear),
                                                      onPressed: () {
                                                        Navigator.of(context).pop();
                                                      },
                                                      color: Colors.white,
                                                    ),
                                                  ],
                                                )),
                                            children: <Widget>[
                                              new Container(
                                                  height: MediaQuery
                                                          .of(context)
                                                          .size
                                                          .height /
                                                      10 *
                                                      6,
                                                  width: MediaQuery
                                                          .of(context)
                                                          .size
                                                          .width /
                                                      10 *
                                                      7,
                                                  child: Image.asset(
                                                    'images/haha.png',
                                                    fit: BoxFit.cover,
                                                  )),
                                            ],
                                          ),
                                        );






刷新


import 'dart:async';

import 'package:flutter/material.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

class Example1 extends StatefulWidget {
  @override
  _Example1State createState() => new _Example1State();
}

class _Example1State extends State<Example1> {
//  RefreshMode  refreshing = RefreshMode.idle;
//  LoadMode loading = LoadMode.idle;
  RefreshController _refreshController;
  List<Widget> data = [];
  void _getDatas() {
    for (int i = 0; i < 14; i++) {
      data.add(new Card(
        margin:
            new EdgeInsets.only(left: 10.0, right: 10.0, top: 5.0, bottom: 5.0),
        child: new Center(
          child: new Text('Data $i'),
        ),
      ));
    }
  }

  void enterRefresh() {
    _refreshController.requestRefresh(true);
  }

  void _onOffsetCallback(bool isUp, double offset) {
    // if you want change some widgets state ,you should rewrite the callback
  }

  @override
  void initState() {
    // TODO: implement initState
    _getDatas();
    _refreshController = new RefreshController();
    super.initState();
  }

  Widget _headerCreate(BuildContext context, int mode) {
    return new ClassicIndicator(
      mode: mode,
      refreshingText: "",
      idleIcon: new Container(),
      idleText: "Load more...",
    );
  }

//  Widget _footerCreate(BuildContext context,int mode){
//    return new ClassicIndicator(mode: mode);
//  }

  @override
  Widget build(BuildContext context) {
    return new Container(
        child: new SmartRefresher(
            enablePullDown: true,
            enablePullUp: true,
            controller: _refreshController,
            onRefresh: (up) {
              if (up)
                new Future.delayed(const Duration(milliseconds: 2009))
                    .then((val) {
                  data.add(new Card(
                    margin: new EdgeInsets.only(
                        left: 10.0, right: 10.0, top: 5.0, bottom: 5.0),
                    child: new Center(
                      child: new Text('Data '),
                    ),
                  ));

                  _refreshController.scrollTo(_refreshController.scrollController.offset+100.0);
                  _refreshController.sendBack(true, RefreshStatus.idle);
                  setState(() {});
//                refresher.sendStatus(RefreshStatus.completed);
                });
              else {
                new Future.delayed(const Duration(milliseconds: 2009))
                    .then((val) {
                  data.add(new Card(
                    margin: new EdgeInsets.only(
                        left: 10.0, right: 10.0, top: 5.0, bottom: 5.0),
                    child: new Center(
                      child: new Text('Data '),
                    ),
                  ));
                  setState(() {});
                  _refreshController.sendBack(false, RefreshStatus.idle);
                });
              }
            },
            onOffsetChange: _onOffsetCallback,
            child: new ListView.builder(
              reverse: true,
              itemExtent: 100.0,
              itemCount: data.length,
              itemBuilder: (context, index) => new Item(),
            )));
  }
}

class Item extends StatefulWidget {
  @override
  _ItemState createState() => new _ItemState();
}

class _ItemState extends State<Item> {
  @override
  Widget build(BuildContext context) {
    return new Card(
      margin:
          new EdgeInsets.only(left: 10.0, right: 10.0, top: 5.0, bottom: 5.0),
      child: new Center(
        child: new Text('Data'),
      ),
    );
  }

  @override
  void dispose() {
    // TODO: implement dispose
    print("销毁");
    super.dispose();
  }
}



new Stack(
          children: <Widget>[new MyContainUtils(""),Card(child:new GestureDetector(),)],

        )