Question

我有一个Xamarin Android应用程序，并尝试发送本地通知。我有这个方法：

    public void SendNotification(Context context, string message)
    {
        var notificationManager = (NotificationManager)context.GetSystemService(Context.NotificationService);


        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            var notificationChannel = new NotificationChannel(CHANNEL_ID, Strings.ApplicationName, NotificationImportance.High);
            notificationManager.CreateNotificationChannel(notificationChannel);
        }

        var intent = new Intent(context, typeof(MainActivity));
        intent.AddFlags(ActivityFlags.ClearTop);
        var pendingIntent = PendingIntent.GetActivity(context, 0, intent, PendingIntentFlags.OneShot);
        var bigstyle = new Notification.BigTextStyle();
        bigstyle.BigText(message);
        bigstyle.SetBigContentTitle(Strings.ApplicationName);
        var notificationBuilder = new Notification.Builder(context)
            .SetSmallIcon(Resource.Drawable.Icon) //Icon  
            .SetContentTitle(Strings.ApplicationName) //Title  
            .SetContentText(message) //Message  
            .SetAutoCancel(true)
            .SetContentIntent(pendingIntent)
            .SetStyle(bigstyle);

        var notification = notificationBuilder.Build();

        notificationManager.Notify(MESSAGE_TYPE_DEFAULT, notification);
    }

出于测试目的，我在我的MainActivity中的On Create Method中调用了一个调用：

            new NotificationService().SendNotification(this, "Test");

我最后一次测试时，是使用Android 7.0而且有效。使用Android 8.0没有抛出错误或类似的东西。我也看不到输出中的任何错误。但它只是没有显示任何通知。

8.0有什么改变或者我做错了吗？

Answer 1

您必须使用Android O中的setChannelId。共享相同的java代码。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String CHANNEL_ID = getResources().getString(R.string.channel_id);// The id of the channel.
            CharSequence name = getString(R.string.app_name);// The user-visible name of the channel.
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
            notificationManager.createNotificationChannel(mChannel);
            Notification.Builder b = new Notification.Builder(BaseActivity.this, CHANNEL_ID);
            b.setAutoCancel(true)
                    .setWhen(System.currentTimeMillis())
                    .setSmallIcon(icon)
                    .setContentTitle(title)
                    .setContentText(content)
                    .setChannelId(CHANNEL_ID)
                    .setContentIntent(contentIntent);
            Notification notification = b.build();
            notificationManager.notify(notificationType, notification);
        }

Answer 2

您需要在notificationManager中添加NotificationChannel。您将在此链接中获得详细信息。 https://www.androidauthority.com/android-8-0-oreo-app-implementing-notification-channels-801097/

Android本地通知未显示

2 个答案: