Xamarin Forms - 处理通知点击

Question

Xamarin Forms - 处理通知点击

xamarinxamarin.formsnotificationsxamarin.androidlocal

6

我有一个Xamarin Forms应用程序，它会引发Android通知，但我在创建一个简单页面时遇到了困难，该页面将与用户交互当他们点击通知时。

我知道在Xamarin.Forms中只有1个活动，因此挂起的意图必须是那个MainActivity

我将LaunchMode设置为SingleTop，并将Intent Filter设置为与pendingIntent中使用的Intent名称匹配

现在，当我点击通知时，我确实被路由到MainActivity的OnResume，但我不明白如何： 1）识别我是因为通知点击而进入这个活动-我尝试添加一个额外的挂起Intent但是我检查this.Intent.Extras时没有找到 2）即使我知道我是因为通知点击而进入该活动，如何从Activity启动特定页面。我对Xamarin很陌生，但我看不到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东西。

- Nick Jones

1个回答

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- SushiHangover · Accepted Answer

请确保您在 MainActivity 中设置了 LaunchMode.SingleTop：

`LaunchMode.SingleTop`

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

在您的MainActivity中（继承自FormsAppCompatActivity子类），添加OnNewIntent覆盖：

OnNewIntent：

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

现在，您可以检查 intent.Action / intent.HasExtra 来确定是否是您发送的通知，并处理它。使用 Xamarin.Forms，最简单的方法是使用 MessagingCenter 发送一个消息，在您的 .NetStd/PCL Xamarin.Forms 代码库中进行订阅。

NotificationClickedOn：

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\n Please send 2 BitCoins to SushiHangover to process your winning ticket! ", 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#pragma warning disable CS0618 // Type or member is obsolete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();
    }
}