/// <summary>
/// Executes everytime the page appears.
/// Changes the app state and starts the update timer.
/// </summary>
protected override async void OnAppearing()
{
base.OnAppearing();
if (KCApi.Properties.State != KCProperties.AppState.Accept)
{
KCApi.Properties.State = KCProperties.AppState.Accept;
Timer(null, null);
if (KCApi.Properties.NetState == KCProperties.NetworkState.Disconnected)
{
lock (KCApi.Properties.StateLock)
KCApi.Properties.State = KCProperties.AppState.Transitioning;
await Navigation.PopAsync();
return;
}
KCApi.Properties.CurrentPosition = await KCApi.GetCurrentPosition();
// Location is not set
if (KCApi.Properties.CurrentPosition.Latitude == 0 && KCApi.Properties.CurrentPosition.Longitude == 0)
{
var text = "GPS signal lost. Please reenable or reenter service.";
Toast.MakeText(CrossCurrentActivity.Current.Activity, text, ToastLength.Short).Show();
}
// Driver is no longer authenticated. Send back to sign in
else if (!Driver_Id.authenticated)
{
var text = "Authentication Failure";
Toast.MakeText(CrossCurrentActivity.Current.Activity, text, ToastLength.Short).Show();
lock (KCApi.Properties.StateLock)
KCApi.Properties.State = KCProperties.AppState.Transitioning;
await Navigation.PopAsync();
}
// Driver has entered the Accept screen for the first time since logging in as CurrentRide is null
else if (KCApi.Properties.RideStatus != KCProperties.RideStatuses.Active && KCApi.Properties.CurrentRide == null)
{
Ride ride = new Ride();
if (KCApi.RecoveryCheck(ride) && KCApi.SetRideLocation(ride))
{
ride.SetDisplayAddress(KCApi.GetAddressFromPosition(new Position(ride.ClientLat, ride.ClientLong)));
KCApi.Start(ride);
lock (KCApi.Properties.StateLock)
KCApi.Properties.State = KCProperties.AppState.Transitioning;
await Navigation.PushAsync(new MapPage());
}
}
updater.Start();
}
}
/// <summary>
/// Timer function which updates the driver if there are any rides in the queue.
/// </summary>
private void Timer(Object source, ElapsedEventArgs e)
{
if (KCApi.Properties.State == KCProperties.AppState.Accept)
{
string status = Task.Run(() => KCApi.CheckQueue()).Result;
if (KCApi.RecoveryCheck(new Ride()))
{
status = "Active ride ongoing";
}
if (KCApi.Properties.NetState == KCProperties.NetworkState.Disconnected)
{
var text = "Internet connection lost.";
lock (KCApi.Properties.StateLock)
{
Device.BeginInvokeOnMainThread(async() =>
{
Toast.MakeText(CrossCurrentActivity.Current.Activity, text, ToastLength.Short).Show();
KCApi.Properties.State = KCProperties.AppState.Transitioning;
await Navigation.PopAsync();
});
return;
}
}
Device.BeginInvokeOnMainThread(() =>
{
Status.Text = status;
if (status.Equals("Rides are available"))
{
StatusColor.BackgroundColor = Color.Green;
}
else
{
StatusColor.BackgroundColor = Color.Gray;
}
});
updater.Interval = 500; // Can optimize to reduce interval depending on time taken
}
}