Show a Map
Your environment is now fully configured, and you have the necessary map platform and MapsIndoors API keys. Next you will learn how to load a map with MapsIndoors.
Lets start by setting up a simple app with a stateful map widget to contain the app.
First add the app to your main and import mapsindoors
import 'package:mapsindoors_mapbox/mapsindoors.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MapsIndoorsDemoApp());
}
class MapsIndoorsDemoApp extends StatelessWidget {
const MapsIndoorsDemoApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter MapsIndoors Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
);
}
}
Now we can create the stateful widget, we require a mapsindoors API key when constructing the map, to ensure the map is only linked to a single mapsindoors instance.
/// The widget that will contain the map
class Map extends StatefulWidget {
const Map({super.key, required this.apiKey});
final String apiKey;
@override
State<Map> createState() => _MapState();
}
class _MapState extends State<Map> {
@override
Widget build(BuildContext context) {
throw UnimplementedError();
}
}
Now we can add the Map to our App
class MapsIndoorsDemoApp extends StatelessWidget {
const MapsIndoorsDemoApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter MapsIndoors Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const Map(
apiKey: 'gettingstarted',
),
);
}
}
Initialize MapsIndoors
We start by loading MapsIndoors
. MapsIndoors
is used to get and store all references to MapsIndoors-specific data. This includes access to all MapsIndoors-specific geodata.
Place the following initialization code in the initState
method of your apps State
that displays the Google map, Ensure that the loadMapsIndoors
callback returns before accessing other MapsIndoors
methods.
class _MapState extends State<Map> {
@override
void initState() {
super.initState();
loadMapsIndoors(widget.apiKey).then((error) {
// if no error occured during loading, then we can start using the SDK
if (error == null) {
// do stuff like fetching locations
}
});
}
}
If you are not a customer you can use this demo MapsIndoors API key mapspeople3d
.
Initialize MapsIndoorsWidget
We now want to add all the data we get by initializing MapsIndoors
to our map. This is done by initializing MapsIndoorsWidget
onto the map. MapsIndoorsWidget
is used as a layer between the map and MapsIndoors.
First add the MapsIndoorsWidget
to the build hierarchy, in this example it is placed in the body of a Scaffold
, but it can be placed anywhere, just ensure there is enough space to use the map comfortably.
Then create a OnMapReadyListener
method to handle the callback from initializing MapsIndoorsWidget
:
class _MapState extends State<Map> {
late MapsIndoorsWidget _mapControl;
@override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
resizeToAvoidBottomInset: false,
appBar: AppBar(title: Text("Getting Started Project")),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
_mapControl = MapsIndoorsWidget(
readyListener: onMapControlReady,
),
],
),
),
);
}
void onMapControlReady(MPError? error) async {
if (error == null) {
...
_mapControl.goTo(await getDefaultVenue());
} else {
// if loading mapcontrol failed inform the user
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text("Map load failed: $error"),
backgroundColor: Colors.red,
));
}
}
}
Expected result:

See the full example of the app here: main.dart
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