Flutter如何提取CashfreePGSDK返回Map键值对数据存入自定义变量

你可以选择以下两种方式实现字段存储，根据你的项目复杂度选择即可：

方案1：直接判断key赋值（适合快速开发） #

先在当前作用域提前声明需要接收的变量，再遍历键值对匹配赋值即可，代码示例如下：

// 提前声明接收变量
String? txStatus;
String? orderAmount;
String? paymentMode;
String? orderId;
String? txTime;
String? signature;
String? txMsg;
String? type;
String? referenceId;

CashfreePGSDK.doPayment(inputParams)
    .then((value) {
      if (value == null) return;
      value.forEach((key, val) {
        switch(key) {
          case "txStatus":
            txStatus = val;
            break;
          case "orderAmount":
            orderAmount = val;
            break;
          case "paymentMode":
            paymentMode = val;
            break;
          case "orderId":
            orderId = val;
            break;
          case "txTime":
            txTime = val;
            break;
          case "signature":
            signature = val;
            break;
          case "txMsg":
            txMsg = val;
            break;
          case "type":
            type = val;
            break;
          case "referenceId":
            referenceId = val;
            break;
        }
      });
      // 赋值完成后即可使用变量处理后续逻辑
    });

方案2：模型类封装（适合正式项目，可维护性更高） #

先定义响应结果的实体类，将返回的Map直接转换为实体对象，后续通过点语法即可读取所有字段：

步骤1：定义实体类 #

class CashFreeResponse {
  final String? txStatus;
  final String? orderAmount;
  final String? paymentMode;
  final String? orderId;
  final String? txTime;
  final String? signature;
  final String? txMsg;
  final String? type;
  final String? referenceId;

  CashFreeResponse({
    this.txStatus,
    this.orderAmount,
    this.paymentMode,
    this.orderId,
    this.txTime,
    this.signature,
    this.txMsg,
    this.type,
    this.referenceId,
  });

  factory CashFreeResponse.fromMap(Map map) {
    return CashFreeResponse(
      txStatus: map["txStatus"],
      orderAmount: map["orderAmount"],
      paymentMode: map["paymentMode"],
      orderId: map["orderId"],
      txTime: map["txTime"],
      signature: map["signature"],
      txMsg: map["txMsg"],
      type: map["type"],
      referenceId: map["referenceId"],
    );
  }
}

步骤2：回调内转换使用 #

CashfreePGSDK.doPayment(inputParams)
    .then((value) {
      if (value == null) return;
      CashFreeResponse response = CashFreeResponse.fromMap(value);
      // 直接读取字段使用示例
      String status = response.txStatus ?? "";
      String amount = response.orderAmount ?? "";
    });

注意事项 #

• 若需要对orderAmount做数值计算，可通过double.parse(response.orderAmount ?? "0")转换为双精度类型使用
• 建议对所有读取的字段做空兼容处理，避免返回字段缺失时出现空异常

内容的提问来源于stack exchange，提问作者Roxx