async Task StartLocationUpdatesAsync()
{
// Create a callback that will get the location updates
if (locationCallback == null)
{
locationCallback = new MyLocationCallback();
locationCallback.LocationUpdated += OnLocationResult;
}
// Get the current client
if (client == null)
{
client = LocationServices.GetFusedLocationProviderClient(this);
}
try
{
//Create request and set intervals:
//Interval: Desired interval for active location updates, it is inexact and you may not receive upates at all if no location servers are available
//Fastest: Interval is exact and app will never receive updates faster than this value
var locationRequest = new LocationRequest()
.SetInterval(10000)
.SetFastestInterval(5000)
.SetPriority(LocationRequest.PriorityHighAccuracy);
await client.RequestLocationUpdatesAsync(locationRequest, locationCallback);
}
catch (Exception ex)
{
//Handle exception here if failed to register
}
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.main);
var toolbar = FindViewById <Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
if (toolbar != null)
{
SetSupportActionBar(toolbar);
SupportActionBar.SetDisplayHomeAsUpEnabled(false);
SupportActionBar.SetHomeButtonEnabled(false);
}
startButton = FindViewById <Button>(Resource.Id.start_updates_button);
startButton.Click += async(sender, args) => await StartLocationUpdatesAsync();
stopButton = FindViewById <Button>(Resource.Id.stop_updates_button);
stopButton.Click += (sender, args) => StopLocationUpdates();
latitudeTextView = FindViewById <TextView>(Resource.Id.latitude_text);
longitudeTextView = FindViewById <TextView>(Resource.Id.longitude_text);
timeTextView = FindViewById <TextView>(Resource.Id.last_update_time_text);
fusedLocationClient = LocationServices.GetFusedLocationProviderClient(this);
settingsClient = LocationServices.GetSettingsClient(this);
if (bundle != null)
{
var keys = bundle.KeySet();
if (keys.Contains(KeyRequesting))
{
requestingUpdates = bundle.GetBoolean(KeyRequesting);
}
if (keys.Contains(KeyLocation))
{
currentLocation = bundle.GetParcelable(KeyLocation) as Location;
}
if (keys.Contains(KeyLastUpdated))
{
lastUpdateTime = bundle.GetString(KeyLastUpdated);
}
}
locationCallback = new MyLocationCallback();
//Create request and set intervals:
//Interval: Desired interval for active location updates, it is inexact and you may not receive upates at all if no location servers are available
//Fastest: Interval is exact and app will never receive updates faster than this value
locationRequest = new LocationRequest()
.SetInterval(UpdateInterval)
.SetFastestInterval(FastestUpdateInterval)
.SetPriority(LocationRequest.PriorityHighAccuracy);
locationSettingsRequest = new LocationSettingsRequest.Builder().AddLocationRequest(locationRequest).Build();
UpdateUI();
}
