flutter sayfalar arası geçiş navigator

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import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: GirisEkrani(),
    );
  }
}
class GirisEkrani extends StatefulWidget {
  @override
  _GirisEkraniState createState() => _GirisEkraniState();
}
class _GirisEkraniState extends State<GirisEkrani> {
  TextEditingController t1 = TextEditingController();
  TextEditingController t2 = TextEditingController();
  girisYap() {
    if (t1.text == "admin" && t2.text == "1234") {
      Navigator.push(
        context,
        MaterialPageRoute(
          builder: (context) => ProfilEkrani(
            kullaniciAdi: t1.text,
            sifre: t2.text,
          ),
        ),
      );
    } else {
      showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: new Text("Yanlış kullanıcı adı veya şifre"),
            content: new Text("Lütfen giriş bilgilerinizi gözden geçirin."),
            actions: <Widget>[
              new FlatButton(
                child: new Text("Kapat"),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ],
          );
        },
      );
    }
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Giriş Ekrani")),
      body: Container(
        margin: EdgeInsets.all(100),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextFormField(
              decoration: InputDecoration(hintText: "Kullanıcı Adı"),
              controller: t1,
            ),
            TextFormField(
              decoration: InputDecoration(hintText: "Şifre"),
              controller: t2,
            ),
            RaisedButton(
                onPressed: () {
                  girisYap();
                },
                child: Text("Giriş Yap")),
          ],
        ),
      ),
    );
  }
}
class ProfilEkrani extends StatefulWidget {
  String kullaniciAdi, sifre;
  ProfilEkrani({this.kullaniciAdi, this.sifre});
  @override
  _ProfilEkraniState createState() => _ProfilEkraniState();
}
class _ProfilEkraniState extends State<ProfilEkrani> {
  cikisYap() {
    Navigator.pop(context);
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Column(
          children: <Widget>[
            RaisedButton(
              onPressed: cikisYap,
              child: Text("Çıkış Yap"),
            ),
            Text("Kullanıcı Adınız: ${widget.kullaniciAdi}"),
            Text("Şifreniz: ${widget.sifre}"),
          ],
        ),
      ),
    );
  }
}

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