Android Geofence在进入/退出时触发，没有错误，但没有GEOFENCE_TRANSITION_标志

Question

我正在使用下面的代码监视geofence转换

LocationServices.GeofencingApi
    .addGeofences(AssistApplication.getApiHelper().getClient(),
                  getGeofencingRequest(),
                  getPendingIntent(context,  
                              GeofenceTransitionIntentService.class))
    .setResultCallback(this);

这就是我构建GeofencingRequest的方法

private GeofencingRequest getGeofencingRequest()
{
    return new GeofencingRequest.Builder()
            .setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER |
                    GeofencingRequest.INITIAL_TRIGGER_EXIT)
            .addGeofence(getGeofence())
            .build();
}

private Geofence getGeofence()
{
    return new Geofence.Builder()
            .setRequestId(requestId)
            .setCircularRegion(latitude, longitude, 100)
            .setExpirationDuration(Geofence.NEVER_EXPIRE)
            .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                    Geofence.GEOFENCE_TRANSITION_EXIT)
            .build();
}

Geofence在进入和退出时正确触发，但是当我使用getGeofenceTransition()时，我得不到三个GEOFENCE_TRANSITION_标志中的任何一个。

protected void onHandleIntent(Intent intent)
{
    final GeofencingEvent event = GeofencingEvent.fromIntent(intent);
    if (event.hasError())
    {
        Log.e(TAG, getErrorMessage(event.getErrorCode()));
        return;
    }

    switch (event.getGeofenceTransition())
    {
        case Geofence.GEOFENCE_TRANSITION_EXIT:
            // Not triggered 
            break;
        case Geofence.GEOFENCE_TRANSITION_ENTER:
        case Geofence.GEOFENCE_TRANSITION_DWELL:
            // Not triggered
            break;
        default:
            // Triggered on exit and enter
    }
}

请告诉我这里遗漏了什么