xamarin Android-Google活动识别过渡api不起作用

Question

我希望使用新的Google Activity Transition API，并且在遵循了here教程之后，我无法获得所需的结果。 如果要使用Transition API，则必须将Xamarin.GooglePlayServices.Location nuget更新为prerelease（70.1501.0）。

从不调用BroadcastReceiver中的OnReceive方法！ 总是调用OnSuccess。

这是我用来设置要检测的活动过渡的代码。

//清单

<uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION" />

//服务

[Service]
    public class Service : IntentService
    {
        public IBinder Binder { get; private set; }
        private PendingIntent pendingIntent;

        public override void OnCreate()
        {
            base.OnCreate();
            List<ActivityTransition> transitions = InitActivityTransitions();
            ActivityTransitionRequest request = new ActivityTransitionRequest(transitions);

            var intent = new Intent(this, typeof(SampleReceiver));
            pendingIntent = PendingIntent.GetBroadcast(this, 0, intent, PendingIntentFlags.UpdateCurrent);

            var task = ActivityRecognition.GetClient(this).RequestActivityTransitionUpdates(request, pendingIntent);
            task.AddOnSuccessListener(new OnSuccessListener());
            task.AddOnFailureListener(new OnFailureListener());
        }

        [BroadcastReceiver(Enabled = true, Exported = false)]
        public class SampleReceiver : BroadcastReceiver
        {
            public override void OnReceive(Context context, Intent intent)
            {           
                Toast.MakeText(context, "OnReceive called! hurray", ToastLength.Long).Show();
            }
        }

        private List<ActivityTransition> InitActivityTransitions()
        {
            List<ActivityTransition> transitions = new List<ActivityTransition>();
            transitions.Add(
                 new ActivityTransition.Builder()
                 .SetActivityType(DetectedActivity.Still)
                 .SetActivityTransition(ActivityTransition.ActivityTransitionEnter)
                 .Build());

            transitions.Add(
                new ActivityTransition.Builder()
            .SetActivityType(DetectedActivity.Still)
            .SetActivityTransition(ActivityTransition.ActivityTransitionExit)
            .Build());
            return transitions;
        }

        public override void OnDestroy()
        {
            ActivityRecognition.GetClient(this).RemoveActivityTransitionUpdates(pendingIntent);
            base.OnDestroy();
        }

        protected override void OnHandleIntent(Intent intent)
        {

        }

        public class OnFailureListener : Java.Lang.Object, IOnFailureListener
        {

            public void OnFailure(Java.Lang.Exception e)
            {

            }
        }

        public class OnSuccessListener : Java.Lang.Object, IOnSuccessListener
        {
            public void OnSuccess(Java.Lang.Object result)
            {

            }
        }
    }

感谢您的帮助。