Flutter短信发送与接收管理插件flutter_sms的使用

插件概述

flutter_sms 是一个用于在Flutter应用程序中发送SMS和MMS的插件。它支持Android和iOS平台，当发送给多个接收者时会以MMS形式发送，在iOS上如果接收者是iPhone并且启用了iMessage，则会通过iMessage发送。

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使用方法

安装和导入包

首先确保你已经在pubspec.yaml文件中添加了flutter_sms依赖项，并且已经运行了flutter pub get命令来安装该包。

然后在Dart代码中导入这个包：

import 'package:flutter_sms/flutter_sms.dart';

发送短信

你可以通过以下几种方式构建短信：

1. 只有消息内容而没有指定接收人。
2. 只有接收人列表但没有消息内容。
3. 同时包含消息内容和接收人列表。

下面是一个简单的例子，展示如何定义一个发送短信的功能：

void _sendSMS(String message, List<String> recipients) async {
  String result = await sendSMS(message: message, recipients: recipients).catchError((onError) {
    print(onError);
  });
  print(result);
}

要发送一条测试消息，可以这样做：

String message = "这是测试信息!";
List<String> recipients = ["1234567890", "5556787676"];
_sendSMS(message, recipients);

直接发送（仅限Android）

对于Android设备，你可以选择直接发送短信而不显示额外的对话框，但这需要特别注意应用商店政策以及用户权限问题。如果你确实需要此功能，请确保你的应用符合相关要求并正确处理权限请求。

String message = "这是测试信息!";
List<String> recipients = ["1234567890", "5556787676"];

String result = await sendSMS(message: message, recipients: recipients, sendDirect: true).catchError((onError) {
  print(onError);
});
print(result);

注意: 使用sendDirect选项还需要在AndroidManifest.xml中声明SEND_SMS权限：

<uses-permission android:name="android.permission.SEND_SMS"/>

示例Demo

为了更好地理解如何在实际项目中使用flutter_sms，这里提供了一个完整的示例程序，展示了如何创建一个界面让用户输入电话号码和消息内容，并最终发送出去。

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_sms/flutter_sms.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late TextEditingController _controllerPeople, _controllerMessage;
  String? _message, body;
  String _canSendSMSMessage = 'Check is not run.';
  List<String> people = [];
  bool sendDirect = false;

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

  Future<void> initPlatformState() async {
    _controllerPeople = TextEditingController();
    _controllerMessage = TextEditingController();
  }

  Future<void> _sendSMS(List<String> recipients) async {
    try {
      String _result = await sendSMS(
        message: _controllerMessage.text,
        recipients: recipients,
        sendDirect: sendDirect,
      );
      setState(() => _message = _result);
    } catch (error) {
      setState(() => _message = error.toString());
    }
  }

  Future<bool> _canSendSMS() async {
    bool _result = await canSendSMS();
    setState(() => _canSendSMSMessage =
        _result ? 'This unit can send SMS' : 'This unit cannot send SMS');
    return _result;
  }

  Widget _phoneTile(String name) {
    return Padding(
      padding: const EdgeInsets.all(3),
      child: Container(
          decoration: BoxDecoration(
              border: Border(
            bottom: BorderSide(color: Colors.grey.shade300),
            top: BorderSide(color: Colors.grey.shade300),
            left: BorderSide(color: Colors.grey.shade300),
            right: BorderSide(color: Colors.grey.shade300),
          )),
          child: Padding(
            padding: const EdgeInsets.all(4),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                IconButton(
                  icon: const Icon(Icons.close),
                  onPressed: () => setState(() => people.remove(name)),
                ),
                Padding(
                  padding: const EdgeInsets.all(0),
                  child: Text(
                    name,
                    textScaleFactor: 1,
                    style: const TextStyle(fontSize: 12),
                  ),
                )
              ],
            ),
          )),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('SMS/MMS Example'),
        ),
        body: ListView(
          children: <Widget>[
            if (people.isEmpty)
              const SizedBox(height: 0)
            else
              SizedBox(
                height: 90,
                child: Padding(
                  padding: const EdgeInsets.all(3),
                  child: ListView(
                    scrollDirection: Axis.horizontal,
                    children: List<Widget>.generate(people.length, (int index) {
                      return _phoneTile(people[index]);
                    }),
                  ),
                ),
              ),
            ListTile(
              leading: const Icon(Icons.people),
              title: TextField(
                controller: _controllerPeople,
                decoration:
                    const InputDecoration(labelText: 'Add Phone Number'),
                keyboardType: TextInputType.number,
                onChanged: (String value) => setState(() {}),
              ),
              trailing: IconButton(
                icon: const Icon(Icons.add),
                onPressed: _controllerPeople.text.isEmpty
                    ? null
                    : () => setState(() {
                          people.add(_controllerPeople.text.toString());
                          _controllerPeople.clear();
                        }),
              ),
            ),
            const Divider(),
            ListTile(
              leading: const Icon(Icons.message),
              title: TextField(
                decoration: const InputDecoration(labelText: 'Add Message'),
                controller: _controllerMessage,
                onChanged: (String value) => setState(() {}),
              ),
            ),
            const Divider(),
            ListTile(
              title: const Text('Can send SMS'),
              subtitle: Text(_canSendSMSMessage),
              trailing: IconButton(
                padding: const EdgeInsets.symmetric(vertical: 16),
                icon: const Icon(Icons.check),
                onPressed: () {
                  _canSendSMS();
                },
              ),
            ),
            SwitchListTile(
                title: const Text('Send Direct'),
                subtitle: const Text(
                    'Should we skip the additional dialog? (Android only)'),
                value: sendDirect,
                onChanged: (bool newValue) {
                  setState(() {
                    sendDirect = newValue;
                  });
                }),
            Padding(
              padding: const EdgeInsets.all(8),
              child: ElevatedButton(
                style: ButtonStyle(
                  backgroundColor: MaterialStateProperty.resolveWith(
                      (states) => Theme.of(context).colorScheme.secondary),
                  padding: MaterialStateProperty.resolveWith(
                      (states) => const EdgeInsets.symmetric(vertical: 16)),
                ),
                onPressed: () {
                  _send();
                },
                child: Text(
                  'SEND',
                  style: Theme.of(context).textTheme.displayMedium,
                ),
              ),
            ),
            Visibility(
              visible: _message != null,
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child: Padding(
                      padding: const EdgeInsets.all(12),
                      child: Text(
                        _message ?? 'No Data',
                        maxLines: null,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _send() {
    if (people.isEmpty) {
      setState(() => _message = 'At Least 1 Person or Message Required');
    } else {
      _sendSMS(people);
    }
  }
}

以上就是关于flutter_sms插件的基本介绍和用法示例，希望对你有所帮助！如果有任何疑问或者需要进一步的帮助，请随时提问。