在我的 flutter 应用中。我正在使用 google_maps_plugin
。链接是https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter .
我想在拖动 map 后将标记固定在 map 中心而不移动。
我想要它喜欢http://jsfiddle.net/UuDA6/
在我的代码中,我使用 MarkerOption
来放置标记。
MarkerOptions options = new MarkerOptions(
alpha: 1.0,
anchor: Offset(0.5, 1.0),
consumeTapEvents: false,
draggable: false,
flat: false,
icon: BitmapDescriptor.defaultMarker,
infoWindowAnchor: Offset(0.5, 0.0),
infoWindowText: InfoWindowText.noText,
position: LatLng(17.411439, 78.5486697),
rotation: 0.0,
visible: true,
zIndex: 0.0,
);
但是在位置
我想知道如何给出 map 的中心。
如果有人对此有任何想法,请分享。
最佳答案
实际上随着 google_maps_flutter: ^0.4.0 的新更新我们可以轻松实现上述要求。
这是演示 link .
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;
}
https://stackoverflow.com/questions/53652573/