代码


import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:jhtoast/jhtoast.dart';
import 'package:jh_flutter_demo/base_appbar.dart';
import 'package:jh_flutter_demo/jh_common/utils/jh_color_utils.dart';
import 'package:jh_flutter_demo/jh_common/widgets/jh_bottom_sheet.dart';
import 'package:jh_flutter_demo/jh_common/widgets/jh_nine_picture.dart';
import 'package:jh_flutter_demo/project/configs/project_config.dart';
import 'package:jh_flutter_demo/project/model/contacts_model.dart';class WxFriendsCirclePage extends StatefulWidget {@override_WxFriendsCirclePageState createState() => _WxFriendsCirclePageState();
}class _WxFriendsCirclePageState extends State<WxFriendsCirclePage> {ScrollController _scrollController = ScrollController();double _imgNormalHeight = 300;double _imgExtraHeight = 0;double _imgChangeHeight = 0;double _scrollMinOffSet = 0;double _navH = 0;double _appbarOpacity = 0.0;var _dataArr = [];@overridevoid initState() {super.initState();_navH = JhScreenUtils.navigationBarHeight;_imgChangeHeight = _imgNormalHeight + _imgExtraHeight;_scrollMinOffSet = _imgNormalHeight - _navH;_addListener();_loadData();}void _loadData() async {// 获取微信运动排行榜数据final jsonStr =await rootBundle.loadString('lib/res/wx_friends_circle.json');Map dic = json.decode(jsonStr);List dataArr = dic['data'];// dataArr.forEach((item) {// });_dataArr = dataArr;setState(() {});}//滚动监听void _addListener() {_scrollController.addListener(() {double _y = _scrollController.offset;// print("滑动距离: $_y");if (_y < _scrollMinOffSet) {_imgExtraHeight = -_y;
//        print(_topH);setState(() {_imgChangeHeight = _imgNormalHeight + _imgExtraHeight;});} else {setState(() {_imgChangeHeight = _navH;});}// //小于0 ，下拉放大// if (_y < 0) {// } else {}//appbar 透明度double appBarOpacity = _y / _navH;if (appBarOpacity < 0) {//透明appBarOpacity = 0.0;} else if (appBarOpacity > 1) {//不透明appBarOpacity = 1.0;}//更新透明度setState(() {_appbarOpacity = appBarOpacity;// print('_appbarO: ${_appbarOpacity}');});});}@overridevoid dispose() {//为了避免内存泄露，_scrollController.dispose_scrollController.dispose();super.dispose();}@overrideWidget build(BuildContext context) {return Scaffold(body: _body(context, _dataArr),);}Widget _body(context, dataArr) {return Stack(children: <Widget>[Container(color: Colors.white,child: MediaQuery.removePadding(context: context,removeTop: true,child: ListView.builder(controller: _scrollController,physics: BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),itemCount: dataArr.length + 1,itemBuilder: (BuildContext context, int index) {if (index == 0) {return Container(width: double.infinity,height: _imgNormalHeight,);}return _cell(context, dataArr[index - 1]);}),),),Positioned(top: 0,left: 0,right: 0,height: _imgChangeHeight,child: _header(context),),Positioned(top: 0,left: 0,right: 0,child: backAppBar(context, '朋友圈',backgroundColor: KColor.kWeiXinBgColor.withOpacity(_appbarOpacity),brightness:_appbarOpacity == 1.0 ? Brightness.light : Brightness.dark,rightImgPath: 'assets/wechat/discover/ic_xiangji.png',rightItemCallBack: () {_clickNav();}),),]);}//_headerWidget _header(context) {return Stack(fit: StackFit.expand,children: [Container(margin: EdgeInsets.only(bottom: 20),color: Colors.white,// child: Image.network(//   'http://img1.mukewang.com/5c18cf540001ac8206000338.jpg',//   fit: BoxFit.cover,// ),child: Image.asset('assets/wechat/discover/friends/wx_bg0.jpeg',// 'assets/wechat/discover/friends/wx_bg1.jpg',fit: BoxFit.cover,),),Positioned(right: 20,bottom: 0,child: Row(children: [Container(margin: EdgeInsets.only(bottom: 10),child: Text('小于',style: TextStyle(color: Colors.white,fontSize: 18.0,fontWeight: FontWeight.w500,),),),SizedBox(width: 20),InkWell(child: Container(height: 75,width: 75,decoration: BoxDecoration(borderRadius: BorderRadius.circular(10),image: DecorationImage(fit: BoxFit.fitHeight,image: AssetImage("assets/images/lufei.png"),),),),onTap: () => _jumpInfo(),),],)),],);}//cellWidget _cell(context, item) {return InkWell(onTap: () => _clickCell(context, item['name']),child: Container(decoration: BoxDecoration(// border: Border.all(color: KColor.kLineColor, width: 1),border: Border(bottom: BorderSide(width: 0.5, color: KColor.kLineColor), //下边框)),child: Row(crossAxisAlignment: CrossAxisAlignment.start,children: [//头像InkWell(onTap: () => _jumpInfo(),child: Container(margin: EdgeInsets.all(15),height: 50,width: 50,decoration: BoxDecoration(color: JhColorUtils.hexColor(item['color']),borderRadius: BorderRadius.circular(8),),child: Center(child: Text(item['name'].substring(0, 1),style: TextStyle(color: Colors.white, fontSize: 20)),),),),Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [Container(margin: EdgeInsets.only(top: 13),child: Text(item['name'],style: TextStyle(color: KColor.kWeiXinTextBlueColor, fontSize: 15),),),Container(margin: EdgeInsets.fromLTRB(0, 5, 15, 5),child: Text(item['content'],style: TextStyle(fontSize: 13),)),_imgs(context, item),Container(margin: EdgeInsets.fromLTRB(0, 5, 15, 10),child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween,children: [Text(item['time'],style: TextStyle(color: KColor.kTextGrayColor, fontSize: 13),),InkWell(child: Container(width: 34,height: 22,decoration: BoxDecoration(borderRadius: BorderRadius.circular(5),color: Color.fromRGBO(240, 240, 240, 1),),child: Image.asset('assets/wechat/discover/ic_diandian.png',color: KColor.kWeiXinTextBlueColor,),),onTap: () => _clickCell(context, '评论'),)],)),])),],),));}//图片viewWidget _imgs(context, item) {return Container(child: JhNinePicture(imgData: item['imgs'],lRSpace: (80.0 + 20.0),onLongPress: () {print('objonLongPressect:');JhBottomSheet.showText(context, dataArr: ["保存图片"]);},));}//点击cell_clickCell(context, text) {JhToast.showText(context, msg: '点击 ${text}');}_clickNav() {JhBottomSheet.showText(context,title: "请选择操作",dataArr: ['拍摄', '从手机相册选择'],clickCallback: (index, text) {});}_jumpInfo() {//跳转个人信息页 跳转传递modelContactsModel model = ContactsModel();model.id = 123;model.name = '小于';model.namePinyin = '小于';model.phone = '17372826674';model.sex = '0';model.region = '淮北市';model.label = '';model.color = '#c579f2';model.avatarUrl = 'https://gitee.com/iotjh/Picture/raw/master/lufei.png';model.isStar = false;String jsonStr = Uri.encodeComponent(jsonEncode(model));NavigatorUtils.pushNamed(context, '${"WxUserInfoPage"}?passValue=${jsonStr}');}
}

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Flutter - 微信朋友圈效果实现

效果图：

代码

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