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我一直在尝试向我的待办事项应用程序添加计划的通知功能，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，我希望在添加按钮时添加通知todoScreen 被点击。任何帮助将非常感激。

todoScreen 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

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1 回答 1

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好的，用颤振推送通知非常容易。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AndroidManifest.xml并/android/app/src/main/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，在Add中转到AppDelegate.swift ：/ios/Runner/

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

在这些行之前：

return super.application(application, didFinishLaunchingWithOptions: launchOptions)

完毕？

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以下内容：

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

还要添加这些finals：

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

现在最后将以下内容添加method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);

现在主要的事情，触发预定的通知，导入你的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！

于 2021-12-22T17:03:22.510 回答