Question

我正在尝试使用标准的Android API显示本地通知：

var message = intent.GetStringExtra("message");
        var title = intent.GetStringExtra("title");

        var notIntent = new Intent(context, typeof(MainActivity));
        var contentIntent = PendingIntent.GetActivity(context, 0, notIntent, PendingIntentFlags.CancelCurrent);
        var manager = NotificationManagerCompat.From(context);

        var style = new NotificationCompat.BigTextStyle();
        style.BigText(message);

        int resourceId = Resource.Drawable.ic_launcher;

        var wearableExtender = new NotificationCompat.WearableExtender()
                .SetBackground(BitmapFactory.DecodeResource(context.Resources, resourceId));

        //Generate a notification with just short text and small icon
        var builder = new NotificationCompat.Builder(context)
                        .SetContentIntent(contentIntent)
                        .SetSmallIcon(Resource.Drawable.ic_launcher)
                        .SetContentTitle(title)
                        .SetContentText(message)
                        .SetStyle(style)
                        .SetWhen(Java.Lang.JavaSystem.CurrentTimeMillis())
                        .SetAutoCancel(true)
                        .Extend(wearableExtender);

        var notification = builder.Build();
        manager.Notify(0, notification);

我尝试了不同版本的通知创建，但它们都没有做任何事情。就好像它从未被调用过但它确实被调用了。我正在测试：三星Galaxy s8 Android 8.0 目标SDK 8.1（奥利奥）

我是否会错过任何要在清单中添加的内容，或者是否有关于新通知渠道的内容？

Answer 1

您应该在Oreo +设备上使用频道（API-26 +）。

类似的东西：

Notification ForegroundNotification(string title, string message)
{
    using (var notificationManager = NotificationManager.FromContext(ApplicationContext))
    {
        var notificationBuilder = new Notification.Builder(ApplicationContext)
                                          .SetContentTitle(title)
                                                        .SetContentText(message)
                                                        .SetSmallIcon(Resource.Drawable.ic_stat_notification_network_locked)
                                                        .SetContentIntent(pendingIntent);
        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            NotificationChannel channel;
            var channelName = ApplicationContext.PackageName;
            channel = notificationManager.GetNotificationChannel(channelName);
            if (channel == null)
            {
                channel = new NotificationChannel(channelName, channelName, NotificationImportance.Default)
                {
                    LockscreenVisibility = NotificationVisibility.Public
                };
                notificationManager.CreateNotificationChannel(channel);
            }
            channel.Dispose();
            notificationBuilder = notificationBuilder
                                              .SetChannelId(channelName);
        }
        return notificationBuilder.Build();
    }
}

因此，NotificationManager.Notify可能会成为：

manager.Notify(0, ForegroundNotification("StackOverflow", "Totally Rocks"));

Xamarin.Android Notification.Notify什么都不做

1 个答案: