如何在颤振中添加计划通知

Question

我一直在尝试向我的待办事项应用程序添加计划通知功能，但无法这样做，当通知应该出现时，它没有并且应用程序崩溃，我希望在添加时添加通知点击 todoScreen 中的按钮。 任何帮助将不胜感激。

tod​​oScreen 链接：https://github.com/Rohith-JN/Reminders_App/blob/main/lib/Screens/TodoScreen.dart

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

Answer 1

好的，使用颤振推送通知非常简单。 将这些依赖项添加到 pubspec.yaml：

dependencies:
  flutter_local_notifications: ^1.4.2
  rxdart: ^0.23.1

特定插件：flutter_local_notifications 和 rxdart

然后在终端中运行这个命令：

flutter pub get

转到/android/app/src/main/ 中的AndroidManifest.xml 并添加以下行：

<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，去/ios/Runner/中的AppDelegate.swift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>();

现在最后将以下method 添加到帮助文件中：

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 main 方法中，添加

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

现在最重要的是， 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

我的朋友你已经完成了！?