'package:flutter/src/widgets/framework.dart':failed - flutter

Question

#main.dart file
import 'package:flutter/material.dart';
import './widgets/new_transaction.dart';
import './widgets/transaction_list.dart';
import './widgets/chart.dart';
import './models/tranasction.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Personal Expenses',
theme: ThemeData(
primarySwatch: Colors.purple,
accentColor: Colors.amber,
// errorColor: Colors.red,
fontFamily: 'Quicksand',
textTheme: ThemeData.light().textTheme.copyWith(
titleMedium: TextStyle(
fontFamily: 'OpenSans',
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
appBarTheme: AppBarTheme(
textTheme: ThemeData.light().textTheme.copyWith(
titleMedium: TextStyle(
fontFamily: 'OpenSans',
fontSize: 20,
fontWeight: FontWeight.bold,
),
),
)),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
// String titleInput;
// String amountInput;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final List<Transaction> _userTransactions = [
// Transaction(
// id: 't1',
// title: 'New Shoes',
// amount: 69.99,
// date: DateTime.now(),
// ),
// Transaction(
// id: 't2',
// title: 'Weekly Groceries',
// amount: 16.53,
// date: DateTime.now(),
// ),
];
List<Transaction> get _recentTransactions {
return _userTransactions.where((tx) {
return tx.date.isAfter(
DateTime.now().subtract(
Duration(days: 7),
),
);
}).toList();
}
void _addNewTransaction(
String txTitle, double txAmount, DateTime chosenDate) {
final newTx = Transaction(
title: txTitle,
amount: txAmount,
date: chosenDate,
id: DateTime.now().toString(),
);
setState(() {
_userTransactions.add(newTx);
});
}
void _startAddNewTransaction(BuildContext ctx) {
showModalBottomSheet(
context: ctx,
builder: (_) {
return GestureDetector(
onTap: () {},
child: NewTransaction(_addNewTransaction),
behavior: HitTestBehavior.opaque,
);
},
);
}
void _deleteTransaction(String id) {
setState(() {
_userTransactions.removeWhere((tx) => tx.id == id);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
'Personal Expenses',
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.add),
onPressed: () => _startAddNewTransaction(context),
),
],
),
body: SingleChildScrollView(
child: Column(
// mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Chart(_recentTransactions),
TransactionList(_userTransactions, _deleteTransaction),
],
),
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () => _startAddNewTransaction(context),
),
);
}
}
#new_transaction.dart file
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:flutter/src/widgets/framework.dart';
class NewTransaction extends StatefulWidget {
final Function addTx;
NewTransaction(this.addTx);
#override
_NewTransactionState createState() => _NewTransactionState();
}
class _NewTransactionState extends State<NewTransaction> {
final _titleController = TextEditingController();
final _amountController = TextEditingController();
late DateTime _selectedDate;
void initState() {
_selectedDate:
DateTime.now();
super.initState();
}
void _submitData() {
if (_amountController.text.isEmpty) {
return;
}
final enteredTitle = _titleController.text;
final enteredAmount = double.parse(_amountController.text);
if (enteredTitle.isEmpty || enteredAmount <= 0 || _selectedDate == null) {
return;
}
widget.addTx(
enteredTitle,
enteredAmount,
_selectedDate,
);
Navigator.of(context).pop();
}
void _presentDatePicker() {
showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(2019),
lastDate: DateTime.now(),
).then((pickedDate) {
if (pickedDate == null) {
return;
}
setState(() {
_selectedDate = pickedDate;
});
});
print('...');
}
#override
Widget build(BuildContext context) {
return Card(
elevation: 5,
child: Container(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
TextField(
decoration: InputDecoration(labelText: 'Title'),
controller: _titleController,
onSubmitted: (_) => _submitData(),
// onChanged: (val) {
// titleInput = val;
// },
),
TextField(
decoration: InputDecoration(labelText: 'Amount'),
controller: _amountController,
keyboardType: TextInputType.number,
onSubmitted: (_) => _submitData(),
// onChanged: (val) => amountInput = val,
),
Container(
height: 70,
child: Row(
children: <Widget>[
Expanded(
child: Text(
_selectedDate == null
? 'No Date Chosen!'
: 'Picked Date: ${DateFormat.yMd().format(_selectedDate)}',
),
),
FlatButton(
textColor: Theme.of(context).primaryColor,
child: Text(
'Choose Date',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
onPressed: _presentDatePicker,
),
],
),
),
RaisedButton(
child: Text('Add Transaction'),
color: Theme.of(context).primaryColor,
textColor: Theme.of(context).textTheme.button?.color,
onPressed: _submitData,
),
],
),
),
);
}
#override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
super.debugFillProperties(properties);
properties
.add(DiagnosticsProperty<DateTime>('_selectedDate', _selectedDate));
}
}
#transaction_list.dart file
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import '../models/tranasction.dart';
class TransactionList extends StatelessWidget {
final List<Transaction> transactions;
TransactionList(
this.transactions, void Function(String id) deleteTransaction);
#override
Widget build(BuildContext context) {
return Container(
height: 300,
child: transactions.isEmpty
? Column(
children: <Widget>[
Text(
'No transactions added yet!',
style: Theme.of(context).textTheme.titleMedium,
),
SizedBox(
height: 20,
),
Container(
height: 200,
child: Image.asset(
'assets/images/waiting.png',
fit: BoxFit.cover,
)),
],
)
: ListView.builder(
itemBuilder: (ctx, index) {
return Card(
elevation: 5,
margin: EdgeInsets.symmetric(
vertical: 8,
horizontal: 5,
),
child: ListTile(
leading: CircleAvatar(
radius: 30,
child: Padding(
padding: EdgeInsets.all(6),
child: FittedBox(
child: Text('\$${transactions[index].amount}'),
),
),
),
title: Text(
transactions[index].title,
style: Theme.of(context).textTheme.titleMedium,
),
subtitle: Text(
DateFormat.yMMMd().format(transactions[index].date),
),
),
);
},
itemCount: transactions.length,
),
);
}
}
#chart.dart file
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import '../models/tranasction.dart';
class TransactionList extends StatelessWidget {
final List<Transaction> transactions;
TransactionList(
this.transactions, void Function(String id) deleteTransaction);
#override
Widget build(BuildContext context) {
return Container(
height: 300,
child: transactions.isEmpty
? Column(
children: <Widget>[
Text(
'No transactions added yet!',
style: Theme.of(context).textTheme.titleMedium,
),
SizedBox(
height: 20,
),
Container(
height: 200,
child: Image.asset(
'assets/images/waiting.png',
fit: BoxFit.cover,
)),
],
)
: ListView.builder(
itemBuilder: (ctx, index) {
return Card(
elevation: 5,
margin: EdgeInsets.symmetric(
vertical: 8,
horizontal: 5,
),
child: ListTile(
leading: CircleAvatar(
radius: 30,
child: Padding(
padding: EdgeInsets.all(6),
child: FittedBox(
child: Text('\$${transactions[index].amount}'),
),
),
),
title: Text(
transactions[index].title,
style: Theme.of(context).textTheme.titleMedium,
),
subtitle: Text(
DateFormat.yMMMd().format(transactions[index].date),
),
),
);
},
itemCount: transactions.length,
),
);
}
}
#chartbar.dart file
import 'package:flutter/material.dart';
class ChartBar extends StatelessWidget {
final String label;
final double spendingAmount;
final double spendingPctOfTotal;
ChartBar(this.label, this.spendingAmount, this.spendingPctOfTotal);
#override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Container(
height: 20,
child: FittedBox(
child: Text('\$${spendingAmount.toStringAsFixed(0)}'),
),
),
SizedBox(
height: 4,
),
Container(
height: 60,
width: 10,
child: Stack(
children: <Widget>[
Container(
decoration: BoxDecoration(
border: Border.all(color: Colors.grey, width: 1.0),
color: Color.fromRGBO(220, 220, 220, 1),
borderRadius: BorderRadius.circular(10),
),
),
FractionallySizedBox(
heightFactor: spendingPctOfTotal,
child: Container(
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius: BorderRadius.circular(10),
),
),
),
],
),
),
SizedBox(
height: 4,
),
Text(label),
],
);
}
}
#transaction.dart file
**i am using the latest version of flutter
and using android studio as emulator,
and using vs code as code editor my code has no errors,
but i keep getting this error after many attempts
i tested using real android device too but nothing changed error message:'package:flutter/src/widgets/framework.dart':failed
assertion:line4864 pos 12:'child==_child':is not true.
see also https://flutter.dev/docs/testing/errors **