configuração inicial Flutter

lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:rkm/screens/login_screen.dart';
+import 'package:rkm/utils/routes.dart';
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      debugShowCheckedModeBanner: false,
+      home: LoginScreen(),
+      initialRoute: '/login',
+      routes: routes,
+    );
+  }
+}

lib/screens/home_screen.dart

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+import 'package:flutter/material.dart';
+
+class HomeScreen extends StatefulWidget {
+  const HomeScreen({Key? key}) : super(key: key);
+
+  @override
+  State<HomeScreen> createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Container(
+        child: Center(
+            child: Text('home')
+        ),
+      ),
+    );
+  }
+}

lib/screens/login_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:rkm/widgets/button_default.dart';
+
+class LoginScreen extends StatefulWidget {
+  const LoginScreen({Key? key}) : super(key: key);
+
+  @override
+  State<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Container(
+        child: Center(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text('Login'),
+                ButtonDefault(
+                  onPressed: ()=>Navigator.pushNamed(context, '/home'),
+                  title: 'Entrar'
+                )
+              ],
+            )
+        ),
+      ),
+    );
+  }
+}

lib/utils/routes.dart

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+import 'package:rkm/screens/home_screen.dart';
+import 'package:rkm/screens/login_screen.dart';
+var routes = {
+  '/home': (context) => const HomeScreen(),
+  '/login': (context) => const LoginScreen(),
+};

lib/widgets/button_default.dart

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+import 'package:flutter/material.dart';
+class ButtonDefault extends StatelessWidget {
+  var onPressed;
+  String title;
+  Color background;
+  Color textColor;
+
+  ButtonDefault({
+    required this.onPressed,
+    required this.title,
+    this.background = Colors.black38,
+    this.textColor = Colors.white
+});
+
+  @override
+  Widget build(BuildContext context) {
+    return TextButton(
+        onPressed: onPressed,
+        style: TextButton.styleFrom(
+          backgroundColor:  background,
+          foregroundColor:  textColor,
+        ),
+        child: Text(
+          title
+        )
+    );
+  }
+}