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Xamarin表单-处理通知单击

local xamarin.android notifications xamarin.forms xamarin

Nick Jones · 技术社区 · 6 年前

我有一个Xamarin表单应用程序,它会引发Android通知,但我很难创建一个简单的页面,当用户单击通知时,该页面将与用户交互。我在Xamarin了解这一点。表单只有1个活动,因此挂起的目的必须是该主活动

我已将LaunchMode设置为SingleTop和and Intent Filter,以匹配PendingEvent中使用的Intent名称

现在,当我单击通知时,我确实会被路由到MainActivity的OnResume,但我不知道如何: 1) 认识到我参与此活动是因为通知点击-我尝试向待定意图添加额外内容,但当我检查此内容时,它不存在。意图额外费用 2) 即使我知道由于通知单击而处于活动中,我如何从活动中启动特定页面。我是Xamarin的新手,但我不知道如何导航到内容页或访问导航堆栈。

这一定是一个非常常见的用例,但我找不到任何相关的。

1 回复 | 直到 6 年前

SushiHangover 6 年前

确保已设置 LaunchMode.SingleTop 在您的 MainActivity :

启动模式。单顶

[Activity(~~~, LaunchMode = LaunchMode.SingleTop, ~~~]
public class MainActivity
{
   ~~~~

在您的 主要活动 (FormsAppCompatActivity子类)添加 OnNewIntent 覆盖:

OnNewIntent公司:

protected override void OnNewIntent(Intent intent)
{
    base.OnNewIntent(intent);
    NotificationClickedOn(intent);
}

现在您可以检查 intent.Action / intent.HasExtra 以确定发送的通知是否是您的,并对其进行处理。具有 Xamarin.Forms 最简单的方法是使用 MessagingCenter 发送在中订阅的邮件。NetStd/PCL 沙马林。表格 代码库。

通知单击打开:

void NotificationClickedOn(Intent intent)
{
    if (intent.Action == "ASushiNotification" && intent.HasExtra("MessageFromSushiHangover"))
    {
        /// Do something now that you know the user clicked on the notification...

        var notificationMessage = intent.Extras.GetString("MessageFromSushiHangover");
        var winnerToast = Toast.MakeText(this, $"{notificationMessage}.\n\nð£ Please send 2 BitCoins to SushiHangover to process your winning ticket! ð£", ToastLength.Long);
        winnerToast.SetGravity(Android.Views.GravityFlags.Center, 0, 0);
        winnerToast.Show();
    }
}

发送通知示例:

void SendNotifacation()
{
    var title = "Winner, Winner, Chicken Dinner";
    var message = "You just won a million StackOverflow reputation points";

    var intent = new Intent(BaseContext, typeof(MainActivity));
    intent.SetAction("ASushiNotification");
    intent.PutExtra("MessageFromSushiHangover", message);
    var pending = PendingIntent.GetActivity(BaseContext, 0, intent, PendingIntentFlags.CancelCurrent);

    using (var notificationManager = NotificationManager.FromContext(BaseContext))
    {
        Notification notification;
        if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.O)
        {
#pragma warning disable CS0618 // Type or member is obsolete
            notification = new Notification.Builder(BaseContext)
                                                        .SetContentTitle(title)
                                                        .SetContentText(message)
                                                        .SetAutoCancel(true)
                                                        .SetSmallIcon(Resource.Drawable.icon)
                                                        .SetDefaults(NotificationDefaults.All)
                                                        .SetContentIntent(pending)
                                                        .Build();
#pragma warning restore CS0618 // Type or member is obsolete
        }
        else
        {
            var myUrgentChannel = BaseContext.PackageName;
            const string channelName = "Messages from SushiHangover";

            NotificationChannel channel;
            channel = notificationManager.GetNotificationChannel(myUrgentChannel);
            if (channel == null)
            {
                channel = new NotificationChannel(myUrgentChannel, channelName, NotificationImportance.High);
                channel.EnableVibration(true);
                channel.EnableLights(true);
                channel.SetSound(
                    RingtoneManager.GetDefaultUri(RingtoneType.Notification),
                    new AudioAttributes.Builder().SetUsage(AudioUsageKind.Notification).Build()
                );
                channel.LockscreenVisibility = NotificationVisibility.Public;
                notificationManager.CreateNotificationChannel(channel);
            }
            channel?.Dispose();

            notification = new Notification.Builder(BaseContext)
                                                        .SetChannelId(myUrgentChannel)
                                                        .SetContentTitle(title)
                                                        .SetContentText(message)
                                                        .SetAutoCancel(true)
                                                        .SetSmallIcon(Resource.Drawable.icon)
                                                        .SetContentIntent(pending)
                                                        .Build();
        }
        notificationManager.Notify(1331, notification);
        notification.Dispose();
    }
}