1-) FLUTTER - hazır paketler ve kullanımı vs

if(EasyLoading.isShow){
  print("zaten açık");
  return ;
}

https://pub.dev/packages/flutter_easyloading

pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  flutter_easyloading: ^3.0.3

EasyLoading.showToast(ogrenci.ad,duration: Duration(seconds: 1),dismissOnTap: true,toastPosition: EasyLoadingToastPosition.bottom);

dismissOnTap -> başka bir yere tıklanınca kapatılsın

AŞAĞIDAKİ VARSAYILAN CONFİG AYARLARINI YÜKLER

void main() {
  runApp(MyApp());
  configLoading();
}
void configLoading() {
  EasyLoading.instance
    ..displayDuration = const Duration(milliseconds: 2000)
    ..indicatorType = EasyLoadingIndicatorType.fadingCircle
    ..loadingStyle = EasyLoadingStyle.dark
    ..indicatorSize = 45.0
    ..radius = 10.0
    ..progressColor = Colors.yellow
    ..backgroundColor = Colors.green
    ..indicatorColor = Colors.yellow
    ..textColor = Colors.yellow
    ..maskColor = Colors.blue.withOpacity(0.5)
    ..userInteractions = true
    ..dismissOnTap = false;
}

return  MaterialApp(
  builder: EasyLoading.init(),

 home: BottomNavigationPage()
);