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  1.  
  2.  
  3. import 'package:flutter/material.dart';
  4. import 'package:provider/provider.dart'; // .yaml file provider: ^3.1.0+1
  5.  
  6. void main() {
  7.   runApp(MaterialApp(
  8.     title: 'Navigation Basics',
  9.     home: FirstRoute(),
  10.   ));
  11. }
  12.  
  13.  
  14. class FirstRoute extends StatelessWidget {
  15.   @override
  16.   Widget build(BuildContext context) {
  17.     return ChangeNotifierProvider(
  18.       builder: (context) => Data(),
  19.       child: Scaffold(
  20.         appBar: AppBar(
  21.           title: Text('First Route'),
  22.         ),
  23.         body: Column(
  24.           children: <Widget>[
  25.             Container(
  26.               width: 256,
  27.               margin: const EdgeInsets.only(bottom: 8),
  28.               child: TextField(
  29.                 decoration: InputDecoration(
  30.                     hintText: 'Enter user name', labelText: 'User Name'),
  31.                 onChanged: (String newUserName){
  32.                   Provider.of<Data>(context).changePassword(newUserName);
  33.                   print(newUserName);
  34.                 },
  35.               ),
  36.             ),
  37.             Container(
  38.               width: 256,
  39.               margin: const EdgeInsets.only(bottom: 8),
  40.               child: TextField(
  41.                 obscureText: true,
  42.                 decoration: InputDecoration(
  43.                     hintText: 'Enter password', labelText: 'Password'),
  44.                 onChanged: (String newPassword){
  45.                   Provider.of<Data>(context).changePassword(newPassword);
  46.                   print(newPassword);
  47.                 },
  48.               ),
  49.             ),
  50.             Center(
  51.               child: RaisedButton(
  52.                 child: Text('Open route'),
  53.                 onPressed: () {
  54.                   Navigator.push(
  55.                     context,
  56.                     MaterialPageRoute(builder: (context) => SecondRoute()),
  57.                   );
  58.                 },
  59.               ),
  60.             ),
  61.           ],
  62.         ),
  63.       ),
  64.     );
  65.   }
  66. }
  67.  
  68. class SecondRoute extends StatelessWidget {
  69.   @override
  70.   Widget build(BuildContext context) {
  71.     return Scaffold(
  72.       appBar: AppBar(
  73.         title: Text("Second Route"),
  74.       ),
  75.       body: Column(
  76.         children: <Widget>[
  77.           Center(
  78.             child: RaisedButton(
  79.               onPressed: () {
  80.                 Navigator.pop(context);
  81.               },
  82.               child: Text('Go back!'),
  83.             ),
  84.           ),
  85.           Text(
  86.             Provider.of<Data>(context).userName,
  87. //            Provider.of<String>(context),
  88.             style: TextStyle(
  89.                 color: Colors.blue,
  90.                 fontSize: 20.0
  91.             ),
  92.           ),
  93.           Text(
  94.             Provider.of<Data>(context).password,
  95. //            Provider.of<String>(context),
  96.             style: TextStyle(
  97.                 color: Colors.green,
  98.                 fontSize: 20.0
  99.             ),
  100.           ),
  101.         ],
  102.       ),
  103.     );
  104.   }
  105. }
Runtime error #stdin #stdout #stderr 1.02s 126372KB
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Error: Could not resolve the package 'flutter' in 'package:flutter/material.dart'.
Error: Could not resolve the package 'provider' in 'package:provider/provider.dart'.
prog.dart:3:8: Error: Not found: 'package:flutter/material.dart'
import 'package:flutter/material.dart';
       ^
prog.dart:4:8: Error: Not found: 'package:provider/provider.dart'
import 'package:provider/provider.dart'; // .yaml file provider: ^3.1.0+1
       ^
prog.dart:16:16: Error: Type 'BuildContext' not found.
  Widget build(BuildContext context) {
               ^^^^^^^^^^^^
prog.dart:16:3: Error: Type 'Widget' not found.
  Widget build(BuildContext context) {
  ^^^^^^
prog.dart:14:26: Error: Type 'StatelessWidget' not found.
class FirstRoute extends StatelessWidget {
                         ^^^^^^^^^^^^^^^
prog.dart:70:16: Error: Type 'BuildContext' not found.
  Widget build(BuildContext context) {
               ^^^^^^^^^^^^
prog.dart:70:3: Error: Type 'Widget' not found.
  Widget build(BuildContext context) {
  ^^^^^^
prog.dart:68:27: Error: Type 'StatelessWidget' not found.
class SecondRoute extends StatelessWidget {
                          ^^^^^^^^^^^^^^^
https://ideone.com/xHXK5m
language:
Dart (dart 2.3.0)
created:
4 years ago
visibility:
public

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