如何在颤动中添加预定通知

Question

我一直在尝试将计划通知功能添加到我的待办事项应用程序，但我无法这样做，当通知应该出现时，它没有出现并且应用程序崩溃了，我希望在以下时间添加通知单击 todoScreen 中的添加按钮。任何帮助将不胜感激。

todoScreen link: https://github.com/Rohith-JN/Reminders_App/blob/main/lib/Screens/TodoScreen.dart

通知link：https://github.com/Rohith-JN/Reminders_App/blob/main/lib/notification_service.dart

Answer 1

好的，用 flutter 推送通知非常简单。将这些 dependencies 添加到 pubspec.yaml:

dependencies:
  flutter_local_notifications: ^1.4.2
  rxdart: ^0.23.1

特定插件：flutter_local_notifications and rxdart

然后运行在终端中执行此命令：

flutter pub get

转到 AndroidManifest.xml 到 /android/app/src/main/ 并添加这些行：

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

现在，转到 AppDelegate.swift 在 /ios/Runner/ 添加：

if #available(iOS 10.0, *) {
UNUserNotificationCenter.current().delegate = self as ? 
UNUserNotificationCenterDelegate    
}

在这些行之前：

return super.application(application, didFinishLaunchingWithOptions: launchOptions)

完成了吗？

现在，创建一个 notifications_helper.dart 文件并导入 flutter_local_notifications 和 rxdart packages。然后在该文件中添加这些：

class NotificationClass{
  final int id;
  final String title;
  final String body;
  final String payload;
NotificationClass({this.id, this.body, this.payload, this.title});
}

同时添加这些 finals:

final rxSub.BehaviorSubject<NotificationClass> didReceiveLocalNotificationSubject =
    rxSub.BehaviorSubject<NotificationClass>();
final rxSub.BehaviorSubject<String> selectNotificationSubject =
    rxSub.BehaviorSubject<String>();

现在终于将以下 method 添加到辅助文件中：

Future<void> initNotifications(
    notifs.FlutterLocalNotificationsPlugin
        notifsPlugin) async {
  var initializationSettingsAndroid =
      notifs.AndroidInitializationSettings('icon');
  var initializationSettingsIOS = notifs.IOSInitializationSettings(
      requestAlertPermission: false,
      requestBadgePermission: false,
      requestSoundPermission: false,
      onDidReceiveLocalNotification:
          (int id, String title, String body, String payload) async {
        didReceiveLocalNotificationSubject
            .add(NotificationClass(id: id, title: title, body: body, payload: payload));
      });
  var initializationSettings = notifs.InitializationSettings(
      initializationSettingsAndroid, initializationSettingsIOS);
  await notifsPlugin.initialize(initializationSettings,
      onSelectNotification: (String payload) async {
    if (payload != null) {
      print('notification payload: ' + payload);
    }
    selectNotificationSubject.add(payload);
  });
  print("Notifications initialised successfully");
}

iOS的权限请求方法：

void requestIOSPermissions(
    notifs.FlutterLocalNotificationsPlugin notifsPlugin) {
  notifsPlugin.resolvePlatformSpecificImplementation<notifs.IOSFlutterLocalNotificationsPlugin>()
      ?.requestPermissions(
        alert: true,
        badge: true,
        sound: true,
      );
}

完成了吗？

现在，预定通知，添加这些：

Future<void> scheduleNotification(
    {notifs.FlutterLocalNotificationsPlugin notifsPlugin,
    String id,
    String title,
    String body,
    DateTime scheduledTime}) async {
  var androidSpecifics = notifs.AndroidNotificationDetails(
    id, // This specifies the ID of the Notification
    'Scheduled notification', // This specifies the name of the notification channel
    'A scheduled notification', //This specifies the description of the channel
    icon: 'icon',
  );
  var iOSSpecifics = notifs.IOSNotificationDetails();
  var platformChannelSpecifics = notifs.NotificationDetails(
      androidSpecifics, iOSSpecifics);
  await notifsPlugin.schedule(0, title, "Scheduled notification",
      scheduledTime, platformChannelSpecifics); // This literally schedules the notification
}

现在修改main.dart文件：

NotificationAppLaunchDetails notifLaunch;
final FlutterLocalNotificationsPlugin notifsPlugin=    
FlutterLocalNotificationsPlugin();

现在在主要方法中，添加

notifLaunch = await notifsPlugin.getNotificationAppLaunchDetails();
await initNotifications(notifsPlugin);
requestIOSPermissions(notifsPlugin);

现在主要的事情，触发预定通知，导入您的 helper file 和 main.dart:

import '../helpers/notifications_helper.dart';
import '../main.dart';

现在调用 scheduleNotification 方法：

scheduleNotification(
    notifsPlugin: notifsPlugin, //Or whatever you've named it in main.dart
    id: DateTime.now().toString(),
    body: "A scheduled Notification",
    scheduledTime: DateTime.now()); //Or whenever you actually want to trigger it

我的朋友，你完成了！

如何在颤动中添加预定通知

How to add Scheduled notification in flutter

flutter

flutter-local-notification