fluwx/example/lib/auth_by_qr_code_page.dart

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:fluwx/fluwx.dart' as fluwx;

class AuthByQRCodePage extends StatefulWidget {
  @override
  _AuthByQRCodePageState createState() => _AuthByQRCodePageState();
}

class _AuthByQRCodePageState extends State<AuthByQRCodePage> {
  String _status = "status";
  Uint8List _image;

  @override
  void initState() {
    super.initState();

    fluwx.onAuthByQRCodeFinished.listen((data) {
      setState(() {
        _status = "errorCode=>${data.errorCode}\nauthCode=>${data.authCode}";
      });
    });
    fluwx.onAuthGotQRCode.listen((image) {
      setState(() {
        _image = image;
      });
    });

    fluwx.onQRCodeScanned.listen((scanned) {
      setState(() {
        _status = "scanned";
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("AuthByQRCode"),
      ),
      body: Column(
        children: <Widget>[
          RaisedButton(
            onPressed: () {
              fluwx.authByQRCode(
                  appId: "wxd930ea5d5a258f4f",
                  scope: "noncestr",
                  nonceStr: "nonceStr",
                  timeStamp: "1417508194",
                  signature: "429eaaa13fd71efbc3fd344d0a9a9126835e7303");
            },
            child: Text("AUTH NOW"),
          ),
          Text(_status),
          _qrCode()
        ],
      ),
    );
  }

  Widget _qrCode() {
    if (_image == null) {
      return Container();
    } else {
      return Image.memory(_image);
    }
  }
}