无法在Xamarin.Forms Android应用程序关闭、停止或未运行时显示FCM远程通知

我使用这些说明将基于Azure通知中心FCM的远程通知添加到我的Xamarin.Forms Android应用程序中。

https://docs.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-xamarin-forms-get-started-push

我的测试设备正在运行API级别22,因此我使用以下方法在设备上生成通知。

Android.Support.V4.App.NotificationCompat.Builder(这个)

对于API级别26+,我将使用以下方法和一个通道在设备上构建通知。

var builder=new Android.App.Notification.builder(这个)

我想我必须使用一个广播接收器来实现这一点,但我真的不知道,在阅读了这么多关于这个主题的评论。我的应用程序是使用API27编译的,目标是API27。

方法1

我正在尝试创建一个广播接收器,当通知到达时,它将使用显式意图启动MyService。不幸的是,这在我的API级别22测试设备上不起作用。

//[BroadcastReceiver]
//[IntentFilter(new[] { Android.Content.Intent.ActionBootCompleted })]
[BroadcastReceiver(Enabled = true, Exported = true)]
    [IntentFilter(new[] { "com.xamarin.example.TEST" })]
    public class MyBroadcastReceiver : BroadcastReceiver
    {

        public override void OnReceive(Context context, Intent intent)
        {
            string message = intent.GetStringExtra("message");
            string title = intent.GetStringExtra("title");
            string id = intent.GetStringExtra("id");

            //Explicit Intent to launch MyService
            Intent intent2 = new Intent(Application.Context, typeof(MyService));
            intent2.PutExtra("message", message);
            intent2.PutExtra("title", title);
            intent2.PutExtra("id", id);

            Application.Context.StartService(intent2);
        }

     }


// Service is exported and given a name so other applications can use it
    [Service(Exported = true, Name = "com.mycompany.myapp.MyService")]
    // Intent filter only needed for Implicit Intents
    //[IntentFilter(new string[] { "com.xamarin.example.TEST" })]
    public class MyService : Service
    {

        public static string PRIMARY_NOTIF_CHANNEL = "default";

        public override IBinder OnBind(Intent intent)
        {
            return null;
        }

        [return: GeneratedEnum]
        public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
        {
            var pm = PowerManager.FromContext(this);
            var wakeLock = pm.NewWakeLock(WakeLockFlags.Partial, "Notification");
            wakeLock.Acquire();

            string message = intent.GetStringExtra("message");
            string title = intent.GetStringExtra("title");
            string id = intent.GetStringExtra("id");

            var intent2 = new Intent(this, typeof(MainActivity));
            intent2.PutExtra("id", id);
            intent2.AddFlags(ActivityFlags.ClearTop);

            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

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

            Android.Support.V4.App.NotificationCompat.Builder builder = new Android.Support.V4.App.NotificationCompat.Builder(this)
                   .SetAutoCancel(true)
                   .SetContentIntent(pendingIntent)
                   .SetContentTitle(title)
                   .SetContentText(message)
                   .SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification))
                   .SetVibrate(new long[1])
                   //1 is Hi
                   .SetPriority(1)
                   .SetLargeIcon(BitmapFactory.DecodeResource(Resources, SalesFlash.Droid.Resource.Drawable.Icon_lg))
                   .SetSmallIcon(MyApp.Droid.Resource.Drawable.icon)
                   .SetChannelId(PRIMARY_NOTIF_CHANNEL);

            notificationManager = NotificationManager.FromContext(this);
            notificationManager.Notify(0, builder.Build());

            wakeLock.Release();

            //return StartCommandResult.Sticky;

            return base.OnStartCommand(intent, flags, startId);
        }

        public override void OnDestroy()
        {
            base.OnDestroy();
        }
    }

根据这篇文章,广播接收器不会为FCM通知工作。 https://stackoverflow.com/a/44287962/5360237

这篇文章似乎显示一个广播接收器正在接受通知。 https://stackoverflow.com/a/45616014/5360237

任何帮助都非常感谢。提前谢谢!