AddMarker method
Implementation
Future<void> AddMarker(double latitude , double longitude,String title , String snippet,String key , bool is_show) async {
if(_channel == null)return ;
if(key == null || key == "")return ;//key不能为空
return _channel?.invokeMethod('AddMarker', {"latitude":latitude,"longitude":longitude,"title":title,"snippet":snippet,"key":key,"is_show":is_show});
}