protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_trip);
// Initialise the action bar
SetSupportActionBar(FindViewById <Toolbar>(Resource.Id.toolbar));
// Create a StorageMechanism instance
PersistentStorage.StorageMechanism = new StorageMechanism(this);
// Link a custom adapter to the 'from' station selecter
fromView = FindViewById <StationAutoComplete>(Resource.Id.autoCompleteTextViewFrom);
fromView.Adapter = new StationAdapter(this, Android.Resource.Layout.SimpleSpinnerDropDownItem);
fromView.InputType = Android.Text.InputTypes.TextFlagNoSuggestions | Android.Text.InputTypes.TextVariationVisiblePassword;
// Link a custom adapter to the 'to' station selecter
toView = FindViewById <StationAutoComplete>(Resource.Id.autoCompleteTextViewTo);
toView.Adapter = new StationAdapter(this, Android.Resource.Layout.SimpleSpinnerDropDownItem);
toView.InputType = Android.Text.InputTypes.TextFlagNoSuggestions | Android.Text.InputTypes.TextVariationVisiblePassword;
// Validate the station names when the text is changed
fromView.TextChanged += ValidateStationFields;
toView.TextChanged += ValidateStationFields;
// Disable the add button by default
addButton = FindViewById <Button>(Resource.Id.buttonAdd);
addButton.Enabled = false;
// Validate the station names again when the add button is pressed
addButton.Click += AddButtonClicked;
// Terminate the activity if the cancel button is clicked
FindViewById <Button>(Resource.Id.buttonCancel).Click += (sender, e) => {
SetResult(Result.Canceled);
Finish();
};
// Read in the fixed (and static) list of stations (aynchronously)
StationStorage.ReadStations(Assets);
}
/// <summary>
/// Validate that the from and to station fileds contain valid stations names, are not the same, and
/// do not represent a valid trip
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void AddButtonClicked(object sender, System.EventArgs e)
{
bool validTrip = true;
string errorMessage = "";
// Check for valid station names
if (Array.IndexOf(StationStorage.StationNames, fromView.Text) < 0)
{
errorMessage += string.Format("'{0}' is not a valid station name\n", fromView.Text);
validTrip = false;
}
if (Array.IndexOf(StationStorage.StationNames, toView.Text) < 0)
{
errorMessage += string.Format("'{0}' is not a valid station name\n", toView.Text);
validTrip = false;
}
if (validTrip == true)
{
// Make sure they are not the same
if (fromView.Text == toView.Text)
{
errorMessage += "Station names cannot be the same\n";
validTrip = false;
}
}
if (validTrip == true)
{
// Check for a duplicate trip
if (TrainTrips.IsDuplicateTrip(fromView.Text, toView.Text) == true)
{
errorMessage += string.Format("A trip from {0} to {1} already exists\n", fromView.Text, toView.Text);
validTrip = false;
}
}
if (validTrip == false)
{
// Display the reason why this trip cannot be added
new AlertDialog.Builder(this)
.SetTitle("Cannot add trip")
.SetMessage(errorMessage)
.SetPositiveButton("OK", (EventHandler <DialogClickEventArgs>)null)
.Create()
.Show();
}
else
{
// Add the trip and close this activity
TrainTrips.AddTrip(new TrainTrip {
From = fromView.Text, To = toView.Text, FromCode = StationStorage.GetCode(fromView.Text),
ToCode = StationStorage.GetCode(toView.Text)
});
RecentStations.AddStation(fromView.Text);
RecentStations.AddStation(toView.Text);
SetResult(Result.Ok);
Finish();
}
}