我需要检索设备的实时位置，我已经在我的服务类中实现了ILocationListener，因为我希望即使在应用程序处于后台或关闭状态下也要运行它-this 即使我更改设备位置，对于我来说似乎也不起作用
带有已实现的ILocationListener的我的服务类
[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 { };
public LocationService()
{
}
// 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
[Obsolete("deprecated in base class")]
public override StartCommandResult OnStartCommand (Intent intent, StartCommandFlags flags, int startId)
{
Log.Debug (logTag, "LocationService started");
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 ()
{
//we can set different location criteria based on requirements for our app -
//for example, we might want to preserve power, or get extreme accuracy
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 an initial fix on location
LocMgr.RequestLocationUpdates(locationProvider, 2000, 0, this);
Log.Debug (logTag, "Now sending location updates");
}
public override void OnDestroy ()
{
base.OnDestroy ();
Log.Debug (logTag, "Service has been terminated");
// Stop getting updates from the location manager:
LocMgr.RemoveUpdates(this);
}
我的活页夹类
public class LocationServiceBinder : Binder
{
public LocationService Service
{
get { return this.service; }
} protected LocationService service;
public bool IsBound { get; set; }
// constructor
public LocationServiceBinder (LocationService service)
{
this.service = service;
}
}
public class LocationServiceConnection : Java.Lang.Object, IServiceConnection
{
public event EventHandler<ServiceConnectedEventArgs> ServiceConnected = delegate {};
public LocationServiceBinder Binder
{
get { return this.binder; }
set { this.binder = value; }
}
protected LocationServiceBinder binder;
public LocationServiceConnection (LocationServiceBinder binder)
{
if (binder != null) {
this.binder = binder;
}
}
// This gets called when a client tries to bind to the Service with an Intent and an
// instance of the ServiceConnection. The system will locate a binder associated with the
// running Service
public void OnServiceConnected (ComponentName name, IBinder service)
{
// cast the binder located by the OS as our local binder subclass
LocationServiceBinder serviceBinder = service as LocationServiceBinder;
if (serviceBinder != null) {
this.binder = serviceBinder;
this.binder.IsBound = true;
Log.Debug ( "ServiceConnection", "OnServiceConnected Called" );
// raise the service connected event
this.ServiceConnected(this, new ServiceConnectedEventArgs () { Binder = service } );
// now that the Service is bound, we can start gathering some location data
serviceBinder.Service.StartLocationUpdates();
}
}
// This will be called when the Service unbinds, or when the app crashes
public void OnServiceDisconnected (ComponentName name)
{
this.binder.IsBound = false;
Log.Debug ( "ServiceConnection", "Service unbound" );
}
}
public class ServiceConnectedEventArgs : EventArgs
{
public IBinder Binder { get; set; }
}
我的MainActivity
public class MainActivity : Activity
{
readonly string logTag = "MainActivity";
// make our labels
TextView latText;
TextView longText;
TextView altText;
TextView speedText;
TextView bearText;
TextView accText;
#region Lifecycle
//Lifecycle stages
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
Log.Debug (logTag, "OnCreate: Location app is becoming active");
SetContentView (Resource.Layout.Main);
// This event fires when the ServiceConnection lets the client (our App class) know that
// the Service is connected. We use this event to start updating the UI with location
// updates from the Service
App.Current.LocationServiceConnected += (object sender, ServiceConnectedEventArgs e) => {
Log.Debug (logTag, "ServiceConnected Event Raised");
// notifies us of location changes from the system
App.Current.LocationService.LocationChanged += HandleLocationChanged;
//notifies us of user changes to the location provider (ie the user disables or enables GPS)
App.Current.LocationService.ProviderDisabled += HandleProviderDisabled;
App.Current.LocationService.ProviderEnabled += HandleProviderEnabled;
// notifies us of the changing status of a provider (ie GPS no longer available)
App.Current.LocationService.StatusChanged += HandleStatusChanged;
};
latText = FindViewById<TextView> (Resource.Id.lat);
longText = FindViewById<TextView> (Resource.Id.longx);
altText = FindViewById<TextView> (Resource.Id.alt);
speedText = FindViewById<TextView> (Resource.Id.speed);
bearText = FindViewById<TextView> (Resource.Id.bear);
accText = FindViewById<TextView> (Resource.Id.acc);
altText.Text = "altitude";
speedText.Text = "speed";
bearText.Text = "bearing";
accText.Text = "accuracy";
// Start the location service:
App.StartLocationService();
}
protected override void OnPause()
{
Log.Debug (logTag, "OnPause: Location app is moving to background");
base.OnPause();
}
protected override void OnResume()
{
Log.Debug (logTag, "OnResume: Location app is moving into foreground");
base.OnResume();
}
protected override void OnDestroy ()
{
Log.Debug (logTag, "OnDestroy: Location app is becoming inactive");
base.OnDestroy ();
// Stop the location service:
App.StopLocationService();
}
#endregion
#region Android Location Service methods
///<summary>
/// Updates UI with location data
/// </summary>
public void HandleLocationChanged(object sender, LocationChangedEventArgs e)
{
Android.Locations.Location location = e.Location;
Log.Debug (logTag, "Foreground updating");
// these events are on a background thread, need to update on the UI thread
RunOnUiThread (() => {
latText.Text = String.Format ("Latitude: {0}", location.Latitude);
longText.Text = String.Format ("Longitude: {0}", location.Longitude);
altText.Text = String.Format ("Altitude: {0}", location.Altitude);
speedText.Text = String.Format ("Speed: {0}", location.Speed);
accText.Text = String.Format ("Accuracy: {0}", location.Accuracy);
bearText.Text = String.Format ("Bearing: {0}", location.Bearing);
});
}
public void HandleProviderDisabled(object sender, ProviderDisabledEventArgs e)
{
Log.Debug (logTag, "Location provider disabled event raised");
}
public void HandleProviderEnabled(object sender, ProviderEnabledEventArgs e)
{
Log.Debug (logTag, "Location provider enabled event raised");
}
public void HandleStatusChanged(object sender, StatusChangedEventArgs e)
{
Log.Debug (logTag, "Location status changed, event raised");
}
#endregion
}
以上public void HandleLocationChanged(object sender, LocationChangedEventArgs e) {}
永远不会因为我的设备位置更改而被解雇