flutter - 如何在不打开Flutter的默认电子邮件应用程序的情况下发送邮件？

Question

是否可以在不打开默认电子邮件应用程序的情况下发送电子邮件？ (直)
我使用了两个插件。但两者都是打开的默认应用。

使用flutter_email_sender插件

      final Email email = Email(
        body:
            'Vendor Name = ${value.title} ${value.ownerName}<br>\nCompany Name = ${value.displayName}',
        subject: 'New Vendor Registed',
        recipients: ['sample@gmail.com'],
        isHTML: true,
      );

await FlutterEmailSender.send(email)

使用 url_launcher插件

                     final String _email = 'mailto:' +
                         'bhanukaisuru96@gmail.com'+
                         '?subject=' +
                         'New Vendor Registered' +
                         '&body=' +
                         'Vendor Name =${value.title} ${value.ownerName}\n' +
                         'Company Name = ${value.displayName}';

await FlutterEmailSender.send(email);

Answer 1

您可以使用sendGridApi和http post request从flutter应用程序直接发送消息。
在这里，您需要将sendGridId添加到here_your_sendGrid_id。
这是示例代码:

  sendRegistrationNotification(String email) async {
Map<String, String> headers = new Map();
headers["Authorization"] =
    "Bearer here_your_sendGrid_id";
headers["Content-Type"] = "application/json";

var url = 'https://api.sendgrid.com/v3/mail/send';
var response = await http.post(url,
    headers: headers,
    body:
        "{\n          \"personalizations\": [\n            {\n              \"to\": [\n                {\n                  \"email\": \"yourmail@gmail.com\"\n                },\n                {\n                  \"email\": \"yourmail@gmail.com\"\n                }\n              ]\n            }\n          ],\n          \"from\": {\n            \"email\": \"yourmail@gmail.com\"\n          },\n          \"subject\": \"Test Message\",\n          \"content\": [\n            {\n              \"type\": \"text\/plain\",\n              \"value\": \"New user register: $email\"\n            }\n          ]\n        }");
print('Response status: ${response.statusCode}');
print('Response body: ${response.body}');

}