Flutter高仿微信系列共59篇，从Flutter客户端、Kotlin客户端、Web服务器、数据库表结构、Xmpp即时通讯服务器、视频通话服务器、腾讯云服务器全面讲解。

详情请查看

效果图：

实现代码：

/**
 * Author : wangning
 * Email : maoning20080809@163.com
 * Date : 2022/10/27 15:21
 * Description : 二维码收款
 */

class QRCodeReceive extends StatefulWidget {

  @override
  State<StatefulWidget> createState() => _QRCodeState();

}

class _QRCodeState extends State<QRCodeReceive> with TickerProviderStateMixin{

  String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);
  UserBean? _userBean;
  String? qrCode;
  //是否隐藏金额
  bool isHideAmount = true;
  //设置返回的金额
  //String setAmount = "";

  UserBean? _fromUserBean;
  PaymentBean? _paymentBean;

  String qrBalance = "";

  late Animation<double> _animation;
  late AnimationController _controller;
  var baseEvent;

  @override
  void initState() {
    super.initState();
    _initAnimator();
    _initBaseEvent();
    initUser();
  }


  void _initAnimator(){
    /// 动画控制器，动画持续时间5秒，可重复播放
    _controller = AnimationController(
      duration: const Duration(seconds: 1),
      vsync: this,
    );
    /// 缩小至 0.2倍大小，放大至3倍大小 非线性动画
    _animation = Tween<double>(begin: 1, end: 1.3).animate(
      CurvedAnimation(
        parent: _controller,
        curve: Curves.easeInCirc,
      ),
    );

    _controller.addStatusListener((status) {
      if(status == AnimationStatus.completed){
        _controller.reverse();
      }
    });
  }

  void _startAnimator(){
    _controller.forward();
  }

  void _initBaseEvent() async {
    baseEvent = eventBus.on<BaseEvent>((baseBean) {
      //显示对方头像信息
      if(baseEvent != null && baseBean.type == BaseEvent.TYPE_QRCODE_PAYMENT){
        Map<String, Object> result = baseBean.result;
        _paymentBean =  result['payment_bean'] as PaymentBean;
        _initFromUser(_paymentBean);
      }
    });
  }

  void initUser() async {
    _fromUserBean = await UserRepository.getInstance().findUserByAccount(_paymentBean?.fromAccount??"");
    _userBean = await UserRepository.getInstance().findUserByAccount(account);

    _refreshQRCode();
  }

  void _refreshQRCode(){
    if(qrBalance == ""){
      qrCode = CommonUtils.QR_RECEIVE_CODE + "0" + ":" + account;
    } else {
      qrCode = CommonUtils.QR_RECEIVE_CODE + qrBalance + ":" + account;
    }
    setState(() {
    });
  }

  void _initFromUser(PaymentBean? _paymentBean) async {
    _fromUserBean = await UserRepository.getInstance().findUserByAccount(_paymentBean?.fromAccount??"");
    _startAnimator();
    setState(() {
    });
  }

  //设置金额
  void _setAmount() async{
    qrBalance = await Navigator.push(context, MaterialPageRoute(builder: (context) => QRCodeSetAmount()));
    isHideAmount = false;
    _refreshQRCode();
  }

  @override
  void dispose() {
    super.dispose();
    eventBus.off(baseEvent);
    _controller.dispose();

  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      body: Container(
        width: double.infinity,
        height: double.infinity,
        color: Color(0xffFFD700),
        child: Column(
          children: [
            topWidget(),
            qrcodeReceiveWidget(),
            userInfo(),
          ],
        ),
      ),
    );
  }

  //顶部返回栏
  Widget topWidget(){
    double appBarHeight = AppManager.getInstance().getAppBarHeight();
    double top = AppManager.getInstance().getTop(context);
    double height = appBarHeight + top;
    return Container(
      margin: EdgeInsets.only(left:12, top: top, right: 12),
      height: height,
      alignment: AlignmentDirectional.center,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          InkWell(
            onTap: (){
              Navigator.pop(context);
            },
            child: Icon(Icons.arrow_back_ios,color: Colors.white,size: 26,),
          ),
          Text("二维码收款", style: TextStyle(fontSize: 22, color: Colors.white, fontWeight: FontWeight.bold),),
          Text(""),
        ],
      ),
    );
  }

  //向商家付款
  Widget qrcodeReceiveWidget(){
    return Container(
      margin: EdgeInsets.only(left: 12, top: 10, right: 12),
      width: double.infinity,
      height: AppManager.getInstance().getWidth(context),
      color: Colors.white,
      child: Stack(
        children: [
          Positioned(
            left:8, top: 8,
            child: Row(
              children: [
                CommonUtils.getBaseIconPng("wc_qrcode_receive_icon", width: 30, height: 30),
                SizedBox(width: 10,),
                Text("二维码收款", style: TextStyle(fontSize: 20, color: Color(0xFFFFD700)),),
              ],
            ),
          ),

          Positioned(
            left: 0,  top: 50, right :0,
              child: Container(
                alignment: AlignmentDirectional.center,
                child: Text("无需加好友，扫收款码向我付钱", style: TextStyle(color: Colors.grey.shade600),),
              ),
          ),

          Positioned(
            left: 0,  top: 80, right :0,
            child: Offstage(
              offstage: isHideAmount,
              child: Container(
                alignment: AlignmentDirectional.center,
                child: Text(qrBalance, style: TextStyle(fontSize: 26, color: Colors.black, fontWeight: FontWeight.bold),),
              ),
            ),
          ),

          Center(
            child: getQrWidget(),
          ),

          Positioned(
            left: 80, bottom: 50,
            child: InkWell(
              onTap: (){
                _setAmount();
              },
              child: Text("设置金额", style: TextStyle(fontSize: 16, color: Colors.black),)
            ),
          ),

          Positioned(
              right: 80, bottom: 50,
              child: Text("保存收款码", style: TextStyle(fontSize: 16, color: Colors.black),)
          ),

        ],
      ),
    );
  }

  //付款用户头像信息
  Widget userInfo(){
    return Offstage(
      offstage: _fromUserBean == null?true:false,
      child: Container(
        margin: EdgeInsets.only(left: 12, top: 10, right: 12),
        padding: EdgeInsets.only(bottom: 10),
        width: double.infinity,
        color: Colors.white,
        child: ScaleTransition(
          scale: _animation,
          child: Container(
            margin: EdgeInsets.only(left: 12, top:10, right: 22),
            child: Row(
              children: [
                CommonAvatarView.showBaseImage(_fromUserBean?.avatar??""),
                SizedBox(width:10),
                Text(_fromUserBean?.nickName??"", style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),),
                Expanded(child: Text("")),
                Text("￥${_paymentBean?.balance}", style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold)),
              ],
            ),
          ),
        ),
      ),
    );
  }

  //获取二维码图片
  Widget getQrWidget(){
    return QrImage(
      data: '${qrCode}',
      version: QrVersions.auto,
      size: 200,
      gapless: false,
      embeddedImage: CommonAvatarView.showQrImage(_userBean?.avatar??""),
      embeddedImageStyle: QrEmbeddedImageStyle(
        size: Size(38, 38),
      ),
    );
  }

}