我正在构建一个应用程序，当它作为后台服务运行时从设备检索位置数据，当它连接到服务器时，它将发送gps数据。问题是应用程序打开时一切正常，当我关闭应用程序时，所有进程都停止工作但应用程序仍然在后台运行。
中的源代码我只对＆＃34; LocationService.cs＆＃34;进行了一些更改。文件。下面是＆＃34; LocationService.cs＆＃34;码。我将其用于测试目的。
[Service]
public class LocationService : Service, ILocationListener
{
public event EventHandler<LocationChangedEventArgs> LocationChanged = delegate { };
public event EventHandler<ProviderDisabledEventArgs> ProviderDisabled = delegate { };
public event EventHandler<ProviderEnabledEventArgs> ProviderEnabled = delegate { };
public event EventHandler<StatusChangedEventArgs> StatusChanged = delegate { };
List<GpsList> _gpsList = new List<GpsList>();
public Location lastLocation;
// Set our location manager as the system location service
protected LocationManager LocMgr = Android.App.Application.Context.GetSystemService("location") as LocationManager;
readonly string logTag = "LocationService";
IBinder binder;
public override void OnCreate()
{
base.OnCreate();
Log.Debug(logTag, "OnCreate called in the Location Service");
}
// This gets called when StartService is called in our App class
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
Log.Debug(logTag, "LocationService started");
// start a task here
new Task(() => {
}).Start();
return StartCommandResult.Sticky;
}
// This gets called once, the first time any client bind to the Service
// and returns an instance of the LocationServiceBinder. All future clients will
// reuse the same instance of the binder
public override IBinder OnBind(Intent intent)
{
Log.Debug(logTag, "Client now bound to service");
binder = new LocationServiceBinder(this);
return binder;
}
// Handle location updates from the location manager
public void StartLocationUpdates()
{
var locationCriteria = new Criteria();
locationCriteria.Accuracy = Accuracy.NoRequirement;
locationCriteria.PowerRequirement = Power.NoRequirement;
// get provider: GPS, Network, etc.
var locationProvider = LocMgr.GetBestProvider(locationCriteria, true);
Log.Debug(logTag, string.Format("You are about to get location updates via {0}", locationProvider));
//GET Last Location
lastLocation = LocMgr.GetLastKnownLocation(locationProvider);
// Get an initial fix on location
LocMgr.RequestLocationUpdates(locationProvider, 3000, 0, this);
Log.Debug(logTag, "Now sending location updates");
}
public override void OnDestroy()
{
base.OnDestroy();
Log.Debug(logTag, "Service has been terminated");
}
List<double> distanceList = new List<double>();
public void OnLocationChanged(Android.Locations.Location location)
{
this.LocationChanged(this, new LocationChangedEventArgs(location));
var distance = location.DistanceTo(lastLocation);
if (distanceList.Contains(distance) != true)
{
distanceList.Add(distance);
}
if (distanceList.Count >= 2)
{
var latestDistance = distanceList[0] - distanceList[1];
Log.Debug(logTag, "LatestDistance " + latestDistance);
distanceList.Clear();
_gpsList.Add(new GpsList()
{
Distance = latestDistance,
Latitude = location.Latitude,
Longitude = location.Longitude,
Altitude = location.Altitude,
Speed = location.Speed,
Heading = location.Bearing,
Date = DateTime.Now.ToString("yy-MM-dd"),
Time = location.Time.ToString(),
Valid = true
});
}
Log.Debug(logTag, "Bearing " + location.Bearing);
Log.Debug(logTag, "Distance " + location.DistanceTo(lastLocation));
string dbPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
var db = new SQLiteConnection(System.IO.Path.Combine(dbPath, "TrackOne.db"));
db.CreateTable<GpsLogData>();
//FOR FILITERING
if (_gpsList.Count >= 1)
{
foreach (var item in _gpsList)
{
var logData = new GpsLogData
{
Latitude = item.Latitude,
Longitude = item.Longitude,
Altitude = item.Altitude,
Speed = item.Speed,
Heading = item.Heading,
Date = item.Date,
Time = item.Time,
Valid = item.Valid
};
db.Insert(logData);
}
_gpsList.Clear();
}
//CHECK FOR INTERNET
ConnectivityManager connectivityManager = (ConnectivityManager)GetSystemService(ConnectivityService);
NetworkInfo activeConnection = connectivityManager.ActiveNetworkInfo;
bool isOnline = (activeConnection != null) && activeConnection.IsConnected;
if (db.Table<GpsLogData>().Count() != 0 && isOnline)
{
var table = db.Table<GpsLogData>();
foreach (var item in table)
{
Log.Debug(logTag, "SEND STRING " + item.Id);
SendGpsString();
db.Delete<GpsLogData>(item.Id);
Log.Debug(logTag, "DELETE RECORD " + item.Id);
}
}
}
public void SendGpsString()
{
//TCP SOCKET
try
{
string textToSend = "sample data";
//---create a TCPClient object at the IP and port no.---
TcpClient client = new TcpClient("192.168.1.2", 8888);
NetworkStream nwStream = client.GetStream();
byte[] bytesToSend = ASCIIEncoding.ASCII.GetBytes(textToSend);
//---send the text---
//Console.WriteLine("Sending : " + textToSend);
nwStream.Write(bytesToSend, 0, bytesToSend.Length);
//---read back the text---
byte[] bytesToRead = new byte[client.ReceiveBufferSize];
int bytesRead = nwStream.Read(bytesToRead, 0, client.ReceiveBufferSize);
//Console.WriteLine("Received : " + Encoding.ASCII.GetString(bytesToRead, 0, bytesRead));
//Console.ReadLine();
client.Close();
}
catch (Exception ex)
{
Log.Info("TrackerX", ex.Message);
}
//END TCP SOCKET
}
public void OnProviderDisabled(string provider)
{
this.ProviderDisabled(this, new ProviderDisabledEventArgs(provider));
}
public void OnProviderEnabled(string provider)
{
this.ProviderEnabled(this, new ProviderEnabledEventArgs(provider));
}
public void OnStatusChanged(string provider, Availability status, Bundle extras)
{
this.StatusChanged(this, new StatusChangedEventArgs(provider, status, extras));
}
}
public class GpsLogData
{
[PrimaryKey, AutoIncrement]
public int Id { get; set; }
public double Distance { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
public double Altitude { get; set; }
public double Speed { get; set; }
public double Heading { get; set; }
public string Date { get; set; }
public string Time { get; set; }
public bool Valid { get; set; }
}
public class GpsList
{
public double Distance { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
public double Altitude { get; set; }
public double Speed { get; set; }
public double Heading { get; set; }
public string Date { get; set; }
public string Time { get; set; }
public bool Valid { get; set; }
}