Flutter 怎么监听Android手机的系统消息通知

一、需求背景

有一次，外国客户使用我公司的手表时，反馈说Android手机在连接手表之后，别人发消息过来接收不到，经过几天的掰扯，最终写了一个demo给客户。

二、实现步骤

使用的插件和版本：flutter_notification_listener: ^1.3.2。

注意：在监听消息通知时，一定要打开对应应用的消息通知权限，否则监听不到

1. 初始化接收端口
2. 设置接收端口名
3. 初始化 NotificationsListener
4. 获取端口名
5. 在端口的监听中进行逻辑操作
6. 开启监听

三、代码分享

1. 安装 flutter_notification_listener

在 pubspec.yaml 文件中添加下面内容：

dependencies:
  flutter_notification_listener: ^1.3.2

2.  在 android > src > main > AndroidManifest.xml文件中注册服务

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

<service android:name="im.zoe.labs.flutter_notification_listener.NotificationsHandlerService"
    android:label="Flutter Notifications Handler"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

3. 使用 flutter_notification_listener

class _NotificationPage extends State<NotificationPage> {
  int _firmwareVersion = -1;
  bool started = true;
  bool _loading = false;

  ReceivePort port = ReceivePort();
  bool hasPort = false;

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

  /// 这里一定要是静态方法
  static void _notificationCallback(NotificationEvent evt) {
    SendPort? send = IsolateNameServer.lookupPortByName("_listener_");
    if (send == null) print("can't find the sender");
    send?.send(evt);
  }

  Future<void> initPlatformState() async {
    if (Platform.isAndroid) {
      if (hasPort) {
        IsolateNameServer.removePortNameMapping("_listener_");
      }
      hasPort = IsolateNameServer.registerPortWithName(port.sendPort, "_listener_");
      NotificationsListener.initialize(callbackHandle: _notificationCallback);
      port.listen((message) => onData(message));
      var isR = await NotificationsListener.isRunning;
      setState(() {
        started = isR!;
      });
    }
  }

  void onData(NotificationEvent event) {
    /// 这里进行逻辑操作
    if (_firmwareVersion != -1) {
      widget.blePlugin.sendMessage(
        MessageBean(
          message: event.text.toString(),
          type: BleMessageType.qq,
          versionCode: _firmwareVersion,
          isHs: true,
          isSmallScreen: true,
        ),
      );
    }
  }

  /// 开启监听
  void startListening() async {
    setState(() {
      _loading = true;
    });
    var hasPermission = await NotificationsListener.hasPermission;
    if (!hasPermission!) {
      NotificationsListener.openPermissionSettings();
      return;
    }

    var isR = await NotificationsListener.isRunning;
    if (!isR!) {
      await NotificationsListener.startService(
        foreground: true,
        title: "Listener Running",
        description: "Welcome to having me"
      );
    }
    setState(() {
      started = true;
      _loading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
            appBar: AppBar(
              title: const Text("Notification"),
            ),
            body: Center(
                child: ListView(children: [
                  Text("firmwareVersion: $_firmwareVersion"),
                  Text("started: $started"),
                  Text("loading: $_loading"),

                  ElevatedButton(onPressed: startListening, child: const Text("start"),),
                  ElevatedButton(
                      child: const Text("queryFirmwareVersion"),
                      onPressed: () async {
                        String firmwareVersion = await widget.blePlugin.queryFirmwareVersion;
                        int index = firmwareVersion.lastIndexOf('-');
                        String subString = firmwareVersion.substring(index);
                        String version = '';
                        subString.replaceAllMapped(RegExp(r'\d'), (Match m) {
                          version += m[0]!;
                          return m[0]!;
                        });
                        setState(() {
                          _firmwareVersion = int.parse(version);
                        });
                      }),
                ]))));
  }
}

四、参考文案

flutter_notification_listener | Flutter Package