API 27 中未显示本地通知

Posted 2023-03-15

【中文标题】API 27 中未显示本地通知

【英文标题】：Local Notifications are not showing in API 27

【发布时间】：2019-02-15 07:36:59

【问题描述】：

通知适用于 Api 26 及以下版本，但不适用于 API 27。

这是我创建通知通道的代码：

private void CreateNotificationChannel()

    try
    
        if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        
            return;
        

        var notificationManager = (NotificationManager)GetSystemService(NotificationService);
        NotificationChannel mChannel = notifManager.GetNotificationChannel("1");
        if (mChannel == null)
        
            mChannel = new NotificationChannel("1", "Chat Application", android.App.NotificationImportance.High);
            mChannel.EnableVibration(true);
            mChannel.SetVibrationPattern(new long[]  100, 200, 300, 400, 500, 400, 300, 200, 400 );
            notifManager.CreateNotificationChannel(mChannel);
        
    
    catch (Exception exception)
    
        LoggingManager.Error(exception);
    

我的通知服务是：

var activity = Forms.Context as Activity;

Intent intent = new Intent(activity, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
Random random = new Random();
int pushCount = random.Next(9999 - 1000) + 1000; //for multiplepushnotifications

intent.AddFlags(ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity(activity, pushCount, intent, PendingIntentFlags.Immutable);

// Instantiate the builder and set notification elements:
NotificationCompat.Builder builder = new NotificationCompat.Builder(Forms.Context,"1")
                                                           .SetContentTitle(messageTitle)
                                                           .SetDefaults(1|2)
                                                           .SetContentText(Message)
                                                           .SetContentIntent(pendingIntent)
                                                           .SetAutoCancel(true)
                                                           .SetChannelId("1")
                                                           .SetPriority(1);
builder.SetSmallIcon(Resource.Drawable.icon);

// Build the notification:
Notification notification = builder.Build();

// Get the notification manager:
NotificationManager notificationManager = Forms.Context.GetSystemService(Context.NotificationService) as NotificationManager;

// Publish the notification:
notificationManager.Notify(5, notification);

请帮助我或给我一些建议，我该如何解决这个问题。

【问题讨论】：

notifManager 中的notifManager.GetNotificationChannel("1"); 是什么NotificationManager？

@G.hakim，是的，它是一个 NotificationManager

您将通知渠道代码放在哪里？

@G.hakim，我已将它放在我的 MainActivity.cs 文件中

【参考方案1】：

我感觉你的频道创建有问题，你可以在下面检查我的工作代码。

 var mChannel = new NotificationChannel(CHANNEL_ID, "Chat Application", Android.App.NotificationImportance.High)
                  
                      Description = "Firebase Cloud Messages appear in this channel"
                  ;
        mChannel.EnableVibration(true);
        mChannel.SetVibrationPattern(new long[]  100, 200, 300, 400, 500, 400, 300, 200, 400 );           

    var notificationManager = (NotificationManager) GetSystemService(NotificationService);
    notificationManager.CreateNotificationChannel(channel);

【参考方案2】：

你能试试吗 notificationManager.Notify(new Random().Next(), notification);

而不是 notificationManager.Notify(5, 通知);

【讨论】：

，我也试过了，但仍然没有显示通知