ElevatedButton(
  onPressed: _launchMap,
  child: Text('Adresi Google Haritalar\'da Aç'),
),

final double latitude = 11.012072;
final double longitude = 18.968116;

Future<void> _launchMap() async {
  String url = 'https://www.google.com/maps/search/?api=1&query=$latitude,$longitude';
    if (!await launchUrl(Uri.parse(url), mode: LaunchMode.externalApplication)) {
      throw 'Could not launch $url';
    }
}

Future<void> _launchMap(String url) async {
  

  if(Platform.isIOS){
    final availableMaps = await MapLauncher.installedMaps;
    print(availableMaps); // [AvailableMap { mapName: Google Maps, mapType: google }, ...]

    await availableMaps.first.showMarker(
      coords: Coords(20.98398114543243, 18.67110493110574),
      title: "Trendyol",
    );

  }else{

    if (!await launchUrl(Uri.parse(url),
        mode: LaunchMode.externalApplication)) {
      throw 'Could not launch $url';
    }

  }

}