Flutter支付集成插件paytmpayments_allinonesdk的使用

使用此插件作为库

1. 添加依赖

在你的项目 pubspec.yaml 文件中添加以下依赖：

dependencies:
  paytmpayments_allinonesdk: ^1.0.0

2. 安装依赖

你可以通过命令行安装依赖包：

使用 Flutter 命令：

$ flutter pub get

或者，你的编辑器可能支持自动获取依赖包。查阅你的编辑器文档以了解更多信息。

3. 导入插件

在你的 Dart 代码中导入插件：

import 'package:paytmpayments_allinonesdk/paytmpayments_allinonesdk.dart';

4. 调用交易方法

示例代码如下：

try {
  var response = PaytmpaymentsAllinonesdk.startTransaction(
      mid, orderId, amount, txnToken, callbackUrl, isStaging, restrictAppInvoke);
  response.then((value) {
    print(value);
    setState(() {
      result = value.toString();
    });
  }).catchError((onError) {
    if (onError is PlatformException) {
      setState(() {
        result = onError.message + " \n  " + onError.details.toString();
      });
    } else {
      setState(() {
        result = onError.toString();
      });
    }
  });
} catch (err) {
  result = err.message;
}

示例代码

以下是完整的示例代码：

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:paytmpayments_allinonesdk/paytmpayments_allinonesdk.dart';
import 'network/initiate_transaction_helper.dart';
import 'edit_text.dart';
import 'dart:math';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(brightness: Brightness.dark),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter App'),
        ),
        body: const HomeScreen(),
      ),
    );
  }
}

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  [@override](/user/override)
  State<StatefulWidget> createState() {
    return _HomeScreenState();
  }
}

class _HomeScreenState extends State<HomeScreen> {
  String mid = "", orderId = "", amount = "1", txnToken = "";
  String result = "";
  bool isStaging = false;
  bool isApiCallInprogress = false;
  String callbackUrl = "";
  bool restrictAppInvoke = false;
  bool enableAssist = true;

  [@override](/user/override)
  void initState() {
    super.initState();
    orderId = generateOrderId();
  }

  String generateOrderId() {
    final randomNum = Random().nextDouble() * DateTime.now().millisecondsSinceEpoch;
    return 'PARCEL${1 + (randomNum % 2000).floor()}A${(randomNum % 100000).floor() + 10000}';
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Card(
      child: SingleChildScrollView(
        child: Container(
          margin: const EdgeInsets.all(8),
          child: Column(
            children: <Widget>[
              EditText('商户ID', mid, onChange: (val) => mid = val),
              EditText('订单ID', orderId, onChange: (val) => orderId = val),
              EditText('金额', amount, onChange: (val) => amount = val),
              EditText('交易令牌', txnToken, onChange: (val) => txnToken = val),
              EditText('回调URL', callbackUrl, onChange: (val) => callbackUrl = val),
              Container(
                margin: const EdgeInsets.all(16),
                child: ElevatedButton(
                  onPressed: _generateTxnToken,
                  child: const Text('生成交易令牌'),
                ),
              ),
              Row(
                children: <Widget>[
                  Checkbox(
                    activeColor: Colors.lightBlue,
                    value: isStaging,
                    onChanged: (bool? val) {
                      setState(() {
                        isStaging = val!;
                      });
                    },
                  ),
                  const Text("测试环境")
                ],
              ),
              Row(
                children: <Widget>[
                  Checkbox(
                    activeColor: Colors.lightBlue,
                    value: restrictAppInvoke,
                    onChanged: (bool? val) {
                      setState(() {
                        restrictAppInvoke = val!;
                      });
                    },
                  ),
                  const Text("限制应用调用")
                ],
              ),
              Container(
                margin: const EdgeInsets.all(16),
                child: ElevatedButton(
                  onPressed: isApiCallInprogress
                      ? null
                      : () {
                          _startTransaction();
                        },
                  child: const Text('开始交易'),
                ),
              ),
              Container(
                alignment: Alignment.bottomLeft,
                child: const Text("消息 :"),
              ),
              Text(result),
            ],
          ),
        ),
      ),
    );
  }

  Future<void> _generateTxnToken() async {
    setState(() {
      result = '';
      txnToken = '';
    });

    if (mid.isEmpty) {
      setState(() {
        result = '商户ID字段为空';
      });
      return;
    }

    if (orderId.isEmpty) {
      setState(() {
        result = '订单ID字段为空';
      });
      return;
    }

    try {
      var initTransactionResponse =
          await InitiateTransactionHelper(mid, amount, orderId, isStaging)
              .makeInitTransactionRequest();
      if (initTransactionResponse.body?.txnToken != null &&
          initTransactionResponse.body?.txnToken?.isNotEmpty == true) {
        setState(() {
          txnToken = initTransactionResponse.body!.txnToken!;
        });
        return;
      } else {
        setState(() {
          result = initTransactionResponse.body?.resultInfo?.resultMsg ??
              '交易API失败';
        });
        return;
      }
    } catch (err) {
      setState(() {
        result = err.toString();
      });
      return;
    }
  }

  Future<void> _startTransaction() async {
    setState(() {
      result = '';
    });

    if (txnToken.isEmpty) {
      setState(() {
        result = '交易令牌字段为空';
      });
      return;
    }

    if (mid.isEmpty) {
      setState(() {
        result = '商户ID字段为空';
      });
      return;
    }

    if (orderId.isEmpty) {
      setState(() {
        result = '订单ID字段为空';
      });
      return;
    }

    try {
      var response = PaytmpaymentsAllinonesdk().startTransaction(
          mid,
          orderId,
          amount,
          txnToken,
          callbackUrl,
          isStaging,
          restrictAppInvoke,
          enableAssist);
      response.then((value) {
        setState(() {
          result = value.toString();
        });
      }).catchError((onError) {
        if (onError is PlatformException) {
          setState(() {
            result = "${onError.message} \n  ${onError.details}";
          });
        } else {
          setState(() {
            result = onError.toString();
          });
        }
      });
    } catch (err) {
      setState(() {
        result = err.toString();
      });
    }
  }
}