实际上，通过google_maps_flutter的新更新：^ 0.4.0，我们可以轻松实现上述要求。
这是演示链接。
Map<MarkerId, Marker> _markers = <MarkerId, Marker>{};
int _markerIdCounter = 0;
Completer<GoogleMapController> _mapController = Completer();
Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
child: GoogleMap(
markers: Set<Marker>.of(_markers.values),
onMapCreated: _onMapCreated,
initialCameraPosition: CameraPosition(
target: Constants.LOCATION_SRI_LANKA,
zoom: 12.0,
),
myLocationEnabled: true,
onCameraMove: (CameraPosition position) {
if(_markers.length > 0) {
MarkerId markerId = MarkerId(_markerIdVal());
Marker marker = _markers[markerId];
Marker updatedMarker = marker.copyWith(
positionParam: position.target,
);
setState(() {
_markers[markerId] = updatedMarker;
});
}
},
),
)
void _onMapCreated(GoogleMapController controller) async {
_mapController.complete(controller);
if ([INITIAL_LOCATION] != null) {
MarkerId markerId = MarkerId(_markerIdVal());
LatLng position = [INITIAL_LOCATION];
Marker marker = Marker(
markerId: markerId,
position: position,
draggable: false,
);
setState(() {
_markers[markerId] = marker;
});
Future.delayed(Duration(seconds: 1), () async {
GoogleMapController controller = await _mapController.future;
controller.animateCamera(
CameraUpdate.newCameraPosition(
CameraPosition(
target: position,
zoom: 17.0,
),
),
);
});
}
}
String _markerIdVal({bool increment = false}) {
String val = 'marker_id_$_markerIdCounter';
if (increment) _markerIdCounter++;
return val;
}
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