Unable to upload my data to firebase in flutter - firebase

Question

I'm very new to flutter and trying to learn it. I have been trying to work with firebase and trying to upload data to it for the storage purpose. I have been using Realtime Database in test mode just to learn it but unfortunately due to some issues it's not working for me now.
The code that I wrote is : -
This is my provider file for interacting with my firebase
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import './product.dart';
class Products with ChangeNotifier {
List<Product> _items = [
Product(
id: 'p1',
title: 'Red Shirt',
description: 'A red shirt - it is pretty red!',
price: 29.99,
imageUrl:
'https://cdn.pixabay.com/photo/2016/10/02/22/17/red-t-shirt-1710578_1280.jpg',
),
Product(
id: 'p2',
title: 'Trousers',
description: 'A nice pair of trousers.',
price: 59.99,
imageUrl:
'https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Trousers%2C_dress_%28AM_1960.022-8%29.jpg/512px-Trousers%2C_dress_%28AM_1960.022-8%29.jpg',
),
Product(
id: 'p3',
title: 'Yellow Scarf',
description: 'Warm and cozy - exactly what you need for the winter.',
price: 19.99,
imageUrl:
'https://live.staticflickr.com/4043/4438260868_cc79b3369d_z.jpg',
),
Product(
id: 'p4',
title: 'A Pan',
description: 'Prepare any meal you want.',
price: 49.99,
imageUrl:
'https://upload.wikimedia.org/wikipedia/commons/thumb/1/14/Cast-Iron-Pan.jpg/1024px-Cast-Iron-Pan.jpg',
),
];
// var _showFavoritesOnly = false;
List<Product> get items {
// if (_showFavoritesOnly) {
// return _items.where((prodItem) => prodItem.isFavorite).toList();
// }
return [..._items];
}
List<Product> get favoriteItems {
return _items.where((prodItem) => prodItem.isFavorite).toList();
}
Product findById(String id) {
return _items.firstWhere((prod) => prod.id == id);
}
// void showFavoritesOnly() {
// _showFavoritesOnly = true;
// notifyListeners();
// }
// void showAll() {
// _showFavoritesOnly = false;
// notifyListeners();
// }
Future<void> addProduct(Product product) {
const url = 'https://random-app-effc2-default-rtdb.firebaseio.com/products.json';
return http
.post(
url,
body: json.encode({
'title': product.title,
'description': product.description,
'imageUrl': product.imageUrl,
'price': product.price,
'isFavorite': product.isFavorite,
}),
)
.then((response) {
final newProduct = Product(
title: product.title,
description: product.description,
price: product.price,
imageUrl: product.imageUrl,
id: json.decode(response.body)['name'],
);
_items.add(newProduct);
// _items.insert(0, newProduct); // at the start of the list
notifyListeners();
});
}
void updateProduct(String id, Product newProduct) {
final prodIndex = _items.indexWhere((prod) => prod.id == id);
if (prodIndex >= 0) {
_items[prodIndex] = newProduct;
notifyListeners();
} else {
print('...');
}
}
void deleteProduct(String id) {
_items.removeWhere((prod) => prod.id == id);
notifyListeners();
}
}
This is my widget code which is directly interacting with my firebase : -
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/product.dart';
import '../providers/products.dart';
class EditProductScreen extends StatefulWidget {
static const routeName = '/edit-product';
#override
_EditProductScreenState createState() => _EditProductScreenState();
}
class _EditProductScreenState extends State<EditProductScreen> {
final _priceFocusNode = FocusNode();
final _descriptionFocusNode = FocusNode();
final _imageUrlController = TextEditingController();
final _imageUrlFocusNode = FocusNode();
final _form = GlobalKey<FormState>();
var _editedProduct = Product(
id: null,
title: '',
price: 0,
description: '',
imageUrl: '',
);
var _initValues = {
'title': '',
'description': '',
'price': '',
'imageUrl': '',
};
var _isInit = true;
var _isLoading = false;
#override
void initState() {
_imageUrlFocusNode.addListener(_updateImageUrl);
super.initState();
}
#override
void didChangeDependencies() {
if (_isInit) {
final productId = ModalRoute.of(context).settings.arguments as String;
if (productId != null) {
_editedProduct =
Provider.of<Products>(context, listen: false).findById(productId);
_initValues = {
'title': _editedProduct.title,
'description': _editedProduct.description,
'price': _editedProduct.price.toString(),
// 'imageUrl': _editedProduct.imageUrl,
'imageUrl': '',
};
_imageUrlController.text = _editedProduct.imageUrl;
}
}
_isInit = false;
super.didChangeDependencies();
}
#override
void dispose() {
_imageUrlFocusNode.removeListener(_updateImageUrl);
_priceFocusNode.dispose();
_descriptionFocusNode.dispose();
_imageUrlController.dispose();
_imageUrlFocusNode.dispose();
super.dispose();
}
void _updateImageUrl() {
if (!_imageUrlFocusNode.hasFocus) {
if ((!_imageUrlController.text.startsWith('http') &&
!_imageUrlController.text.startsWith('https')) ||
(!_imageUrlController.text.endsWith('.png') &&
!_imageUrlController.text.endsWith('.jpg') &&
!_imageUrlController.text.endsWith('.jpeg'))) {
return;
}
setState(() {});
}
}
void _saveForm() {
final isValid = _form.currentState.validate();
if (!isValid) {
return;
}
_form.currentState.save();
setState(() {
_isLoading = true;
});
if (_editedProduct.id != null) {
Provider.of<Products>(context, listen: false)
.updateProduct(_editedProduct.id, _editedProduct);
setState(() {
_isLoading = false;
});
Navigator.of(context).pop();
} else {
Provider.of<Products>(context, listen: false)
.addProduct(_editedProduct)
.then((_) {
setState(() {
_isLoading = false;
});
Navigator.of(context).pop();
});
}
// Navigator.of(context).pop();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Edit Product'),
actions: <Widget>[
IconButton(
icon: Icon(Icons.save),
onPressed: _saveForm,
),
],
),
body: _isLoading
? Center(
child: CircularProgressIndicator(),
)
: Padding(
padding: const EdgeInsets.all(16.0),
child: Form(
key: _form,
child: ListView(
children: <Widget>[
TextFormField(
initialValue: _initValues['title'],
decoration: InputDecoration(labelText: 'Title'),
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) {
FocusScope.of(context).requestFocus(_priceFocusNode);
},
validator: (value) {
if (value.isEmpty) {
return 'Please provide a value.';
}
return null;
},
onSaved: (value) {
_editedProduct = Product(
title: value,
price: _editedProduct.price,
description: _editedProduct.description,
imageUrl: _editedProduct.imageUrl,
id: _editedProduct.id,
isFavorite: _editedProduct.isFavorite);
},
),
TextFormField(
initialValue: _initValues['price'],
decoration: InputDecoration(labelText: 'Price'),
textInputAction: TextInputAction.next,
keyboardType: TextInputType.number,
focusNode: _priceFocusNode,
onFieldSubmitted: (_) {
FocusScope.of(context)
.requestFocus(_descriptionFocusNode);
},
validator: (value) {
if (value.isEmpty) {
return 'Please enter a price.';
}
if (double.tryParse(value) == null) {
return 'Please enter a valid number.';
}
if (double.parse(value) <= 0) {
return 'Please enter a number greater than zero.';
}
return null;
},
onSaved: (value) {
_editedProduct = Product(
title: _editedProduct.title,
price: double.parse(value),
description: _editedProduct.description,
imageUrl: _editedProduct.imageUrl,
id: _editedProduct.id,
isFavorite: _editedProduct.isFavorite);
},
),
TextFormField(
initialValue: _initValues['description'],
decoration: InputDecoration(labelText: 'Description'),
maxLines: 3,
keyboardType: TextInputType.multiline,
focusNode: _descriptionFocusNode,
validator: (value) {
if (value.isEmpty) {
return 'Please enter a description.';
}
if (value.length < 10) {
return 'Should be at least 10 characters long.';
}
return null;
},
onSaved: (value) {
_editedProduct = Product(
title: _editedProduct.title,
price: _editedProduct.price,
description: value,
imageUrl: _editedProduct.imageUrl,
id: _editedProduct.id,
isFavorite: _editedProduct.isFavorite,
);
},
),
Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Container(
width: 100,
height: 100,
margin: EdgeInsets.only(
top: 8,
right: 10,
),
decoration: BoxDecoration(
border: Border.all(
width: 1,
color: Colors.grey,
),
),
child: _imageUrlController.text.isEmpty
? Text('Enter a URL')
: FittedBox(
child: Image.network(
_imageUrlController.text,
fit: BoxFit.cover,
),
),
),
Expanded(
child: TextFormField(
decoration: InputDecoration(labelText: 'Image URL'),
keyboardType: TextInputType.url,
textInputAction: TextInputAction.done,
controller: _imageUrlController,
focusNode: _imageUrlFocusNode,
onFieldSubmitted: (_) {
_saveForm();
},
validator: (value) {
if (value.isEmpty) {
return 'Please enter an image URL.';
}
if (!value.startsWith('http') &&
!value.startsWith('https')) {
return 'Please enter a valid URL.';
}
if (!value.endsWith('.png') &&
!value.endsWith('.jpg') &&
!value.endsWith('.jpeg')) {
return 'Please enter a valid image URL.';
}
return null;
},
onSaved: (value) {
_editedProduct = Product(
title: _editedProduct.title,
price: _editedProduct.price,
description: _editedProduct.description,
imageUrl: value,
id: _editedProduct.id,
isFavorite: _editedProduct.isFavorite,
);
},
),
),
],
),
],
),
),
),
);
}
}

Answer 1

final url = Uri.parse('https://random-app-effc2-default-rtdb.firebaseio.com/products.json');
use this code instead of
const url = 'https://random-app-effc2-default-rtdb.firebaseio.com/products.json';