FlutterのMethodChannelで複数パラメータ使う

公式ドキュメント

Flutter -> host

Flutter

  const channel = MethodChannel('channnelName');
  final result =
      await channel.invokeMethod('methodName', <String, dynamic>{
    'param1': foo,
    'param2': bar,
  });

Android

methodChannel.setMethodCallHandler { call, result ->
    when (call.method) {
        "methodName" -> {
            val param1 = call.argument<Int>("param1")
            val param2 = call.argument<Int>("param2")
            result(param1 * param2)
        }
    }
}

iOS

        methodChannel?.setMethodCallHandler({(call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            switch call.method {
            case "methodName":
                if let args = call.arguments as? Dictionary<String, Any>,
                    let param1 = args["param1"] as? Int,
                    let param2 = args["param2"] as? Int {
                    result(param1 * param2)
                } else {
                    result(FlutterError.init(code: "bad args", message: nil, details: nil))
                }
                break
            default:
                break
            }
        })

host -> Flutter

Android

            val params = hashMapOf(
                Pair("param1", 1),
                Pair("param2", 2),
            )
            methodChannel.invokeMethod("methodName", params)

iOS

        var params = [String: Any]()
        params["param1"] = 1
        params["param2"] = 2
        methodChannel.invokeMethod("methodName", arguments: params)

Flutter

    methodChannel.setMethodCallHandler((call) {
      switch (call.method) {
        case "loadStart":
          int param1 = call.arguments["param1"];
          int param2 = call.arguments["param2"];
          print(param1 * param2);
          break;
      }
      return Future.value('complete');
    });