addImageMarkers method

Future<List<NavigationMarker>> addImageMarkers(List<NavigationMarker> markers)

Add a Marker Group to the Map imagePath is the path to the image asset, allow only image in png, jpeg, jpg format

Implementation

Future<List<NavigationMarker>> addImageMarkers(
    List<NavigationMarker> markers) async {
  List<Map<String, dynamic>> markerList = [];
  await Future.forEach(markers, (NavigationMarker marker) async {
    try {
      ByteData data = await rootBundle.load(marker.imagePath);
      var jsonData = marker.toJson();
      if (Platform.isAndroid) {
        var bytes =
            data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);

        jsonData['imageBytes'] = bytes;
      } else if (Platform.isIOS) {
        var base64String = base64Encode(
            data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
        jsonData['imageBase64'] = base64String;
      }

      markerList.add(jsonData);
    } catch (e) {
      debugPrint(e.toString());
    }
  });
  var i = 0;
  var markerMap = {for (var e in markerList) i++: e};

  List<Object?> listMarkerId = await _methodChannel.invokeMethod(
      MethodChannelEvent.addMarkers, markerMap);
  if (listMarkerId.isNotEmpty) {
    for (var element in markers) {
      element.markerId = listMarkerId[markers.indexOf(element)] as int?;
    }
    return markers;
  } else {
    return [];
  }
}