Question

我正在尝试整理一个简单的跟踪应用。它所做的只是注册位置更新，而不是每15秒从设备位置发送到webapi（Web服务）服务。以下是执行注册和发布到服务器的代码。

    #region START STOP TRACKING
    public void StartTracking()
    {
        if (currentAsset == null) { return; }
        isTracking = true;
        //SETUP THE LOCATION VARIALBES
        if (_geocoder == null) { _geocoder = new Geocoder(this); }
        if (_locationManager == null) { _locationManager = (LocationManager)GetSystemService(LocationService); }

        var criteria = new Criteria() { Accuracy = Accuracy.Fine };
        string bestProvider = _locationManager.GetBestProvider(criteria, true);

        Location lastKnownLocation = _locationManager.GetLastKnownLocation(bestProvider);

        //LOG RECORD FOR CURRENT LOCATION
        if (lastKnownLocation != null)
        {
            PostData(lastKnownLocation, DateTime.Now);
        }

        _locationManager.RequestLocationUpdates(bestProvider, 2000, 1, this);

        BusTimer.Start();
    }

    private void OnTimeEvent(object source, ElapsedEventArgs e)
    {
        RunOnUiThread(delegate
        {
            var criteria = new Criteria() { Accuracy = Accuracy.Fine };
            string bestProvider = _locationManager.GetBestProvider(criteria, true);
            Location lastKnownLocation = _locationManager.GetLastKnownLocation(bestProvider);

            //LOG RECORD FOR CURRENT LOCATION
            if (lastKnownLocation != null)
            {
                PostData(lastKnownLocation, DateTime.Now);
            }

        });
    }
    public void StopTracking()
    {
        isTracking = false;
        _locationManager.RemoveUpdates(this);
        BusTimer.Stop();
    }
    #endregion

    #region POST LOCATION DATA TO SERVER
    private void PostData(Location setLocation, DateTime setDate)
    {
        try
        {
            currentLocation = setLocation;
             string longString = string.Format("{0}", setLocation.Longitude);
            string latString = string.Format("{0}", setLocation.Latitude);

            //POST DATA OVER
            var client = new RestClient("http://mywebserver/");
            var request = new RestRequest("API/DataAPI/PerformAction", Method.GET);
            request.AddParameter("ActionName", "PostEntityData"); // adds to POST or URL querystring based on Method
            string JSONString = "{'EntityID':" + currentAsset.AssetID.ToString() + ",'EntityName':'Asset','Long':" + longString + ",'Lat':" + latString + ", 'CheckDateTime':'" + setDate.ToString("yyyy-MM-dd HH:mm:ss") + "'}";
            request.AddParameter("ActionData", JSONString); // adds to POST or URL querystring based on Method         
            client.ExecuteAsync(request, response =>
            {
                Console.WriteLine(response.Content);   
                this.RunOnUiThread(new Runnable(PostToastData));                                                       
            });                                                
        }
        catch (System.Exception e)
        {
            Console.Write(e.Message);
        }                           
    }

     public void PostToastData()
     {             
         string longString = string.Format("{0}", currentLocation.Longitude);
         string latString = string.Format("{0}", currentLocation.Latitude);
         Toast.MakeText(this, "Logged Location record for " + currentAsset.AssetNumber + " at Long: " + longString + ", Lat: " + latString, ToastLength.Short).Show();
     }
    #endregion

这一切都很完美。当我最小化应用程序时，它会继续正确地将数据发布到服务中。问题是在大约一个小时后，应用程序意外地死了。

任何人都可以看到在一定时间后它会崩溃的原因吗？该应用程序几乎没有使用任何内存，所以我不认为这将是一个内存问题。我应该在不同的庄园中处理在后台运行的应用程序吗？我应该在不同的线程上执行此过程，以便在应用程序未处于焦点时可以继续在后台执行吗？

任何建议都将受到赞赏。

由于

Answer 1

如果您想在应用失去焦点后继续在后台运行内容，则应使用后台服务。以下是一些可以帮助您入门的链接：

monodroid让app在最小化应用程序后继续执行

1 个答案: