Xamarin 表单:推送通知在 Android 7.1.2 上不起作用

Question

>推送通知在版本号为 7.1.2 的 Android 设备上不起作用，但在版本 9 上工作正常。以下是我用于显示通知的代码。

if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {
            var intent = new Intent(this, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
            var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent);
            var notificationManager = NotificationManager.FromContext(this);
            notificationManager.Notify(0, notificationBuilder.Build());
        }
        else
        {
            var intent = new Intent(this, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
            var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent)
                        .SetChannelId(Utils.CHANNEL_ID);
            if (Build.VERSION.SdkInt < BuildVersionCodes.O)
            {
                return;
            }
            var channel = new NotificationChannel(Utils.CHANNEL_ID, "FCM Notifications", NotificationImportance.High)
            {
                Description = "Firebase Cloud Messages appear in this channel"
            };
            var notificationManager = (NotificationManager)GetSystemService(NotificationService);
            notificationManager.CreateNotificationChannel(channel);
            notificationManager.Notify(0, notificationBuilder.Build());
        }

任何人都可以为此提出解决方案吗？

Answer 1

我按照这个例子https://learn.microsoft.com/en-us/azure/notification-hubs/xamarin-notification-hubs-push-notifications-android-gcm

我从生产项目中发布了我的发送通知方法。

按照我的工作代码并更改您的方法。

    void SendNotification (string messageBody, string title)
    {
        var intent = new Intent (this, typeof (SplashActivity));
        intent.AddFlags (ActivityFlags.ClearTop);
        var pendingIntent = PendingIntent.GetActivity (this, 0, intent, PendingIntentFlags.OneShot);

        //if i want more than one notification ,different unique value in every call
        Random u = new Random ();
        if (Build.VERSION.SdkInt >= BuildVersionCodes.O) {
            string channelName = Resources.GetString (Resource.String.channel_name);
            NotificationCompat.Builder notificationBuilder;

                 notificationBuilder = new NotificationCompat.Builder (this, channelName)
                        .SetContentTitle (title)
                        .SetSmallIcon (Resource.Drawable.ic_stat_g)
                        .SetContentText (messageBody)
                        .SetAutoCancel (true)
                        .SetContentIntent (pendingIntent);

            var notificationManager = GetSystemService (Context.NotificationService) as NotificationManager;

            NotificationChannel channel = new NotificationChannel (channelName, "notification channel", NotificationImportance.Default);
            notificationManager.CreateNotificationChannel (channel);
            notificationManager.Notify (u.Next(), notificationBuilder.Build ());

        } 
        else
        {
            NotificationCompat.Builder notificationBuilder;

                 notificationBuilder = new NotificationCompat.Builder (this)
                    .SetContentTitle (title)
                    .SetSmallIcon (Resource.Drawable.ic_stat_g)
                    .SetContentText (messageBody)
                    .SetAutoCancel (true)
                    .SetContentIntent (pendingIntent);

            var notificationManager = GetSystemService (Context.NotificationService) as NotificationManager;
            notificationManager.Notify (u.Next(), notificationBuilder.Build ());
        }
    }

首先不要使用 Android.App.Notification.Builder 已被弃用。NotificationCompat.Builder是新的。

也许这个是你的新代码

var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {
            var notificationBuilder = new NotificationCompat.Builder(this)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent);
            var notificationManager = GetSystemService (Context.NotificationService) as NotificationManager;
            notificationManager.Notify(0, notificationBuilder.Build());
        }
        else
        {
            var notificationBuilder = new NotificationCompat.Builder(this, Utils.CHANNEL_ID)
                        .SetContentTitle(Header)
                        .SetSmallIcon(Resource.Drawable.icon)
                        .SetContentText(body)
                        .SetAutoCancel(true)
                        .SetContentIntent(pendingIntent);

            var notificationManager = GetSystemService (Context.NotificationService) as NotificationManager;
            NotificationChannel channel = new NotificationChannel (Utils.CHANNEL_ID, "FCM Notifications", NotificationImportance.Default);
            notificationManager.CreateNotificationChannel (channel);
            notificationManager.Notify (0, notificationBuilder.Build ());
        }

Answer 2

Firebase 通知的行为会有所不同，具体取决于接收应用的前台/后台状态。

应用在后台运行时发送的通知消息。在这种情况下，通知将传递到设备的系统托盘。默认情况下，用户点击通知会打开应用启动器。

在后台接收时同时包含通知和数据有效负载的消息。在这种情况下，通知将传递到设备的系统托盘，并且数据有效负载将在启动器活动意图的额外内容中传递。

有关更多信息，请访问 https://firebase.google.com/docs/cloud-messaging/android/receive

我也有这个示例代码供您尝试：

var notificationManager = GetSystemService(Context.NotificationService) as NotificationManager;
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
    NotificationChannel notificationChannel = new NotificationChannel("my_channel", "This is my Notification Channel", NotificationImportance.High);
    builder.SetChannelId("my_channel");
    notificationManager.CreateNotificationChannel(notificationChannel);
}

var notification = builder.SetContentIntent(PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.Immutable))
                          .SetSmallIcon(Resource.Drawable.icon)
                          .SetContentTitle(Header)
                          .SetContentText(body)

        //Set vibrate
        .SetVibrate(new long[] { 200, 200, 200, 200 })
        //LED
        .SetLights(Android.Graphics.Color.Blue, 1000, 1000)
        //Auto cancel will remove the notification once the user touches it
        .SetAutoCancel(true).Build();

notificationManager.Notify(0, notification);