Flutter easyrefresh示例 上拉加载+下拉刷新

官方示例，简单改了下，实现功能为主。

代码如下：

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_easyrefresh/easy_refresh.dart';

class BasicPage extends StatefulWidget {
  @override
  _BasicPageState createState() => _BasicPageState();
}

class _BasicPageState extends State<BasicPage> {
  List<String> addStr = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"];
  List<String> str = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"];
  GlobalKey<EasyRefreshState> _easyRefreshKey = GlobalKey<EasyRefreshState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("EasyRefresh"),
      ),
      body: Center(
          child: new EasyRefresh(
            key: _easyRefreshKey,
            
            child: new ListView.builder(
              //ListView的Item
                itemCount: str.length,
                itemBuilder: (BuildContext context, int index) {
                  return new Container(
                      height: 70.0,
                      child: Card(
                        child: new Center(
                          child: new Text(
                            str[index],
                            style: new TextStyle(fontSize: 18.0),
                          ),
                        ),
                      ));
                }),
            onRefresh: () async {
              await new Future.delayed(const Duration(seconds: 1), () {
                setState(() {
                  str.clear();
                  str.addAll(addStr);
                });
              });
            },
            loadMore: () async {
              await new Future.delayed(const Duration(seconds: 1), () {
                if (str.length < 20) {
                  setState(() {
                    str.addAll(addStr);
                  });
                }
              });
            },
          )),
      
    );
  }
}

特殊效果+底部按钮，代码如下：

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_easyrefresh/easy_refresh.dart';
import 'package:flutter_easyrefresh/bezier_circle_header.dart';//如果要使用炫酷的样式需要引入，不同的样式引入不同的文件，详见官方api
import 'package:flutter_easyrefresh/bezier_bounce_footer.dart';//如果要使用炫酷的样式需要引入，不同的样式引入不同的文件，详见官方api

class BasicPage extends StatefulWidget {
  @override
  _BasicPageState createState() => _BasicPageState();
}

class _BasicPageState extends State<BasicPage> {
  List<String> addStr = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"];
  List<String> str = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"];
  GlobalKey<EasyRefreshState> _easyRefreshKey = new GlobalKey<EasyRefreshState>();
  GlobalKey<RefreshHeaderState> _headerKey = new GlobalKey<RefreshHeaderState>();
  GlobalKey<RefreshFooterState> _footerKey = new GlobalKey<RefreshFooterState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("EasyRefresh"),
      ),
      body: Center(
          child: new EasyRefresh(
            key: _easyRefreshKey,
            refreshHeader: BezierCircleHeader(
              key: _headerKey,
              color: Theme.of(context).scaffoldBackgroundColor,
            ),
            refreshFooter: BezierBounceFooter(
              key: _footerKey,
              color: Theme.of(context).scaffoldBackgroundColor,
            ),
            child: new ListView.builder(
              //ListView的Item
                itemCount: str.length,
                itemBuilder: (BuildContext context, int index) {
                  return new Container(
                      height: 70.0,
                      child: Card(
                        child: new Center(
                          child: new Text(
                            str[index],
                            style: new TextStyle(fontSize: 18.0),
                          ),
                        ),
                      ));
                }),
            onRefresh: () async {
              await new Future.delayed(const Duration(seconds: 1), () {
                setState(() {
                  str.clear();
                  str.addAll(addStr);
                });
              });
            },
            loadMore: () async {
              await new Future.delayed(const Duration(seconds: 1), () {
                if (str.length < 20) {
                  setState(() {
                    str.addAll(addStr);
                  });
                }
              });
            },
          )),
      persistentFooterButtons: <Widget>[
        FlatButton(
            onPressed: () {
              _easyRefreshKey.currentState.callRefresh();
            },
            child: Text("refresh", style: TextStyle(color: Colors.black))),
        FlatButton(
            onPressed: () {
              _easyRefreshKey.currentState.callLoadMore();
            },
            child: Text("loadMore", style: TextStyle(color: Colors.black)))
      ], 
    );
  }
}

效果图：