dart_connect_metro 0.1.2 
dart_connect_metro: ^0.1.2 copied to clipboard
hexcat.devThis SDK provides convenient access to information, including real-time updates and schedules, allowing developers to enhance the functionality of their DC Metro-related apps.
import 'package:dart_connect_metro/dart_connect_metro.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:intl/intl.dart';
late final String apiKey;
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
// For this demo to work, you will need to create an assets folder and put a
// file called api_key.key in it. The file should contain your API key with
// no spaces or new lines.
apiKey = await rootBundle.loadString('assets/api_key.key');
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Dart Connect Metro Demo',
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
MyHomePage({super.key});
// The station codes for the example route. Normally, you would get these
// programmatically.
static const String federalTriangleCode = 'D01';
static const String rosslynCode = 'C05';
/// The future that will fetch the station to station information.
final Future<List<StationToStation>> stationToStationFuture =
fetchStationToStation(
apiKey,
startStationCode: federalTriangleCode,
destinationStationCode: rosslynCode,
);
/// The future that will fetch the path information.
final Future<Path> pathFuture = fetchPath(
apiKey,
startStationCode: federalTriangleCode,
destinationStationCode: rosslynCode,
);
/// The future that will fetch the next train information.
final Future<List<NextTrain>> nextTrainFuture = fetchNextTrains(
apiKey,
stationCodes: [federalTriangleCode],
);
/// The future that will fetch the rail incidents.
final Future<List<RailIncident>> incidentFuture = fetchRailIncidents(apiKey);
/// The future that will fetch the elevator and escalator incidents at the
/// start station.
final Future<List<AdaIncident>> adaIncidencesFuture1 = fetchAdaIncidents(
apiKey,
stationCode: federalTriangleCode,
);
/// The future that will fetch the elevator and escalator incidents at the
/// destination station.
final Future<List<AdaIncident>> adaIncidencesFuture2 = fetchAdaIncidents(
apiKey,
stationCode: rosslynCode,
);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Dart Connect Metro Demo'),
),
body: SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 25),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
// ROUTE INFO - hard coded for cleaner example
_routeInfo(),
const SizedBox(height: 40.0),
// TIME
_time(),
const SizedBox(height: 15.0),
// COST
_cost(),
const SizedBox(height: 15.0),
// INCIDENTS
_incidents(context),
const SizedBox(height: 15.0),
// LINE
_route(),
],
),
),
),
);
}
/// Show the start and end destinations for the example route.
Widget _routeInfo() {
return const Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
// CURRENT STATION
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Icon(Icons.location_on_outlined),
Text(
'Current Station',
style: TextStyle(fontWeight: FontWeight.bold),
),
Text('Federal Triangle'),
],
),
),
// RIGHT ARROWS
Icon(Icons.keyboard_double_arrow_right_outlined),
// DESTINATION STATION
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Icon(Icons.not_listed_location_outlined),
Text(
'Destination Station',
style: TextStyle(fontWeight: FontWeight.bold),
),
Text('Rosslyn'),
],
),
),
],
);
}
/// Show the time for the example route.
Widget _time() {
return _myContainer(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
// DEPART
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
// ICON
const Icon(Icons.departure_board_outlined, size: 30.0),
const SizedBox(height: 9.0),
// DEPARTURE TIME
FutureBuilder(
future: Future.wait([
pathFuture,
nextTrainFuture,
]),
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is List) {
// Get the values of the futures.
final Path? path = snapshot.data?[0] as Path?;
final List<NextTrain>? nextTrains =
snapshot.data?[1] as List<NextTrain>?;
// Verify values are not null.
if (path != null && nextTrains != null) {
return _getTimeText(path, nextTrains);
}
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
},
),
],
),
),
const Text('to'),
// ARRIVE
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
// ICON
const Icon(Icons.access_time_outlined, size: 30.0),
const SizedBox(height: 9.0),
// ARRIVAL TIME
FutureBuilder(
future: Future.wait([
stationToStationFuture,
pathFuture,
nextTrainFuture,
]),
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is List) {
// Get the values of the futures
final List<StationToStation>? stationToStation =
snapshot.data?[0] as List<StationToStation>?;
final Path? path = snapshot.data?[1] as Path?;
final List<NextTrain>? nextTrains =
snapshot.data?[2] as List<NextTrain>?;
// Verify values are not null
if (stationToStation != null &&
path != null &&
nextTrains != null) {
return _getTimeText(
path,
nextTrains,
stationToStation,
);
}
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
},
),
],
),
),
],
),
);
}
/// Show the cost for the example route.
Widget _cost() {
/// Formats the fare cost to be in US dollars.
final NumberFormat dollarAmount = NumberFormat('#,##0.00', 'en_US');
return _myContainer(
child: FutureBuilder(
future: Future.wait([
stationToStationFuture,
pathFuture,
nextTrainFuture,
]),
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is List) {
// Get the values of the futures.
final List<StationToStation>? stationToStation =
snapshot.data?[0] as List<StationToStation>?;
final Path? path = snapshot.data?[1] as Path?;
final List<NextTrain>? nextTrains =
snapshot.data?[2] as List<NextTrain>?;
// Verify values are not null.
if (path != null &&
nextTrains != null &&
stationToStation != null) {
/// Get the time that the next train will arrive to pick you
/// up.
final Time time = _getTime(path, nextTrains);
/// Get the cost of the trip.
final double cost = stationToStation.first.railFare
.fareAtTime(time.toDateTime());
/// Get the cost of the trip for a senior citizen.
final double seniorCost =
stationToStation.first.railFare.seniorCitizen;
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// NORMAL FARE
Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
// DOLLAR AMOUNT
Text(
'\$${dollarAmount.format(cost)}',
style: const TextStyle(fontSize: 20.0),
),
const SizedBox(width: 3.0),
// FARE label
const Text('Fare'),
],
),
const SizedBox(height: 5.0),
// SENIOR/DISABLED FARE
Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
// DOLLAR AMOUNT
Text('\$${dollarAmount.format(seniorCost)}'),
const SizedBox(width: 5.0),
// FARE label
const Text('Fare (Senior/Disabled)'),
],
),
],
);
}
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
},
),
);
}
/// Show any incidents for the example route.
///
/// This is dynamic; so, sometimes, there may be no incidents.
Widget _incidents(BuildContext context) {
return _myContainer(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// INCIDENTS label
const Text(
'Incidences',
style: TextStyle(fontWeight: FontWeight.bold),
),
// HANDICAP button
InkWell(
onTap: () => _showHandicapAlert(context),
child: const Icon(Icons.wheelchair_pickup_outlined),
),
],
),
const SizedBox(height: 8.0),
FutureBuilder(
future: Future.wait([incidentFuture, pathFuture]),
builder: ((context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is List) {
// Get the values of the futures.
final List<RailIncident>? railIncidents =
snapshot.data?[0] as List<RailIncident>?;
final Path? path = snapshot.data?[1] as Path?;
// Verify values are not null.
if (path != null && railIncidents != null) {
// Get line code to match with incidents.
final String lineCode = path.items.first.lineCode;
/// The incidents that affect the example route.
final List<RailIncident> relevantIncidents = railIncidents
.where((incident) =>
incident.affectedLines.contains(lineCode))
.toList();
if (relevantIncidents.isEmpty) {
return const Center(
child: Text('No incidents for this route.'),
);
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
for (RailIncident incident in relevantIncidents)
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// INCIDENT TYPE
Text(
incident.incidentType,
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
const SizedBox(height: 3.0),
// INCIDENT DESCRIPTION
Text(incident.description),
const SizedBox(height: 10.0),
],
),
],
);
}
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
}),
),
],
),
);
}
/// Show the line for the example route.
Widget _route() {
return _myContainer(
child: FutureBuilder(
future: pathFuture,
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is Path) {
final Path path = snapshot.data as Path;
// Get line code to match with incidents.
final String lineCode = path.items.first.lineCode;
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'$lineCode Line',
style: const TextStyle(fontWeight: FontWeight.bold),
),
const SizedBox(height: 5.0, width: double.maxFinite),
for (PathItem pathItem
in path.items.sublist(0, path.items.length - 1))
Column(
children: [
// INCIDENT DESCRIPTION
Text(pathItem.stationName),
const SizedBox(height: 5.0),
const Center(
child: Icon(
Icons.keyboard_arrow_down_outlined,
size: 15,
),
),
const SizedBox(height: 5.0),
],
),
Center(
child: Text(path.items.last.stationName),
),
],
);
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
},
),
);
}
/// The light grey boxes that divide sections of the UI.
Widget _myContainer({required Widget child}) {
return Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10.0),
color: const Color.fromRGBO(240, 240, 245, 1.0),
),
padding: const EdgeInsets.all(10.5),
child: child,
);
}
/// Get the time that the next train will arrive to pick you up.
Time _getTime(Path path, List<NextTrain> nextTrains,
[List<StationToStation>? stationToStation]) {
// Get line code to match with next train.
final String lineCode = path.items.first.lineCode;
// Get the next train for the line.
late final NextTrain nextTrain;
for (NextTrain train in nextTrains) {
if (train.line == lineCode) {
nextTrain = train;
break;
}
}
// Get the time of the next train.
final DateTime nextTrainTime =
DateTime.now().add(Duration(minutes: nextTrain.minutesAway ?? 0));
// Create Time object for easier string manipulation.
final Time time = Time.fromDateTime(nextTrainTime);
if (stationToStation != null) {
for (StationToStation station in stationToStation) {
time.add(Duration(minutes: station.travelTimeMinutes));
}
}
return time;
}
/// Get the time that the next train will arrive to pick you up.
Widget _getTimeText(Path path, List<NextTrain> nextTrains,
[List<StationToStation>? stationToStation]) {
final Time time = _getTime(path, nextTrains, stationToStation);
return Text(
'${time.timeStr_12h}${time.hour < 12 ? '' : ' pm'}',
style: const TextStyle(fontSize: 20.0),
);
}
void _showHandicapAlert(BuildContext context) {
showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: const Text('Handicap Incidents'),
content: FutureBuilder(
future: Future.wait([
adaIncidencesFuture1,
adaIncidencesFuture2,
]),
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data != null && snapshot.data is List) {
// Get the values of the futures.
final List<AdaIncident>? incidentList1 = snapshot.data?[0];
final List<AdaIncident>? incidentList2 = snapshot.data?[1];
// Verify values are not null.
if (incidentList1 != null && incidentList2 != null) {
if (incidentList1.isEmpty && incidentList2.isEmpty) {
return const Text('No handicap incidents for the '
'stations in your route.');
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// STATION NAME
if (incidentList1.isNotEmpty)
Padding(
padding: const EdgeInsets.only(bottom: 9.0),
child: Text(
incidentList1.first.stationName,
style: const TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
// INCIDENTS
for (AdaIncident incident in incidentList1)
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// INCIDENT TYPE
Text(
incident.unitType.value,
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
const SizedBox(height: 3.0),
// INCIDENT DESCRIPTION
Text(incident.locationDescription),
const SizedBox(height: 10.0),
],
),
const SizedBox(height: 25.0),
// STATION NAME
if (incidentList2.isNotEmpty)
Padding(
padding: const EdgeInsets.only(bottom: 9.0),
child: Text(
incidentList2.first.stationName,
style: const TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
// INCIDENTS
for (AdaIncident incident in incidentList2)
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// INCIDENT TYPE
Text(
incident.unitType.value,
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
const SizedBox(height: 3.0),
// INCIDENT DESCRIPTION
Text(incident.locationDescription),
const SizedBox(height: 10.0),
],
),
],
);
}
}
return const Text('Error!');
} else if (snapshot.hasError) {
return const Text('Error!');
}
return const CircularProgressIndicator();
},
),
);
},
);
}
}Metadata
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Metadata
This SDK provides convenient access to information, including real-time updates and schedules, allowing developers to enhance the functionality of their DC Metro-related apps.
Repository (GitHub)
View/report issues
Topics
Documentation
Funding
Consider supporting this project:
www.buymeacoffee.com
paypal.me
venmo.com
License
MIT (license)
