large image when clicking - flutter - flutter

Question

I have an algorithm working, and I need to click on the image to show it on the entire screen, I have not succeeded, I send all the code, add a comment "// THIS IS THE IMAGE I NEED TO LOOK BIG WHEN I CLICK" which is the image that I want to make it look large when I click it, I have tried in several ways but I have not been able to solve it, and the only thing I am missing is this functionality.
import 'dart:async';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:tienda/models/productos_model.dart';
import 'package:tienda/pages/otra_pagina.dart';
import 'package:tienda/pages/crear_productos.dart';
import 'package:tienda/pages/pedido_lista.dart';
import 'package:tienda/services/firebase_services.dart';
import 'package:tienda/widgets/header.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
//title: 'Flutter Demo',
theme: ThemeData(
//primarySwatch: Colors.yellow,
primaryColor: Colors.yellow[800],
),
home: MyHomePage(title: 'RETO SAN JOSE CHAPARRAL'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<ProductosModel> _productosModel = List<ProductosModel>();
List<ProductosModel> _listaCarro = [];
FirebaseService db = new FirebaseService();
StreamSubscription<QuerySnapshot> productSub;
#override
void initState() {
super.initState();
_productosModel = new List();
productSub?.cancel();
productSub = db.getProductList().listen((QuerySnapshot snapshot) {
final List<ProductosModel> products = snapshot.documents
.map((documentSnapshot) =>
ProductosModel.fromMap(documentSnapshot.data))
.toList();
setState(() {
this._productosModel = products;
});
});
}
#override
void dispose() {
productSub?.cancel();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
actions: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 16.0, top: 8.0),
child: GestureDetector(
child: Stack(
alignment: Alignment.topCenter,
children: <Widget>[
Icon(
Icons.shopping_cart,
size: 38,
),
if (_listaCarro.length > 0)
Padding(
padding: const EdgeInsets.only(left: 2.0),
child: CircleAvatar(
radius: 8.0,
backgroundColor: Colors.red,
foregroundColor: Colors.white,
child: Text(
_listaCarro.length.toString(),
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 12.0),
),
),
),
],
),
onTap: () {
if (_listaCarro.isNotEmpty)
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => Cart(_listaCarro),
),
);
},
),
)
],
),
drawer: Container(
width: 170.0,
child: Drawer(
child: Container(
width: MediaQuery.of(context).size.width * 0.5,
//color: Colors.black, //color de menu principal
color: Colors.yellow[800],
child: new ListView(
padding: EdgeInsets.only(top: 30.0),
children: <Widget>[
Container(
height: 120,
child: new UserAccountsDrawerHeader(
accountName: new Text(''),
accountEmail: new Text(''),
decoration: new BoxDecoration(
image: new DecorationImage(
fit: BoxFit.fill,
image: AssetImage('assets/images/food1x.png'),
),
),
),
),
new Divider(),
new ListTile(
title: new Text(
'productos',
style: TextStyle(color: Colors.white),
),
trailing: new Icon(
Icons.fastfood,
size: 30.0,
color: Colors.white,
),
onTap: () =>
Navigator.of(context).push(new MaterialPageRoute(
builder: (BuildContext context) => CrearProductos(),
)),
),
new Divider(),
],
),
),
),
),
body: SafeArea(
child: SingleChildScrollView(
child: Container(
child: Column(
children: <Widget>[
Stack(
children: <Widget>[
WaveClip(),
Container(
color: Colors.transparent,
padding: const EdgeInsets.only(left: 24, top: 48),
height: 170,
child: ListView.builder(
itemCount: _productosModel.length,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return Row(
children: <Widget>[
Container(
height: 300,
padding: new EdgeInsets.only(
left: 10.0, bottom: 10.0),
child: Card(
elevation: 7.0,
clipBehavior: Clip.antiAlias,
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(24)),
child: AspectRatio(
aspectRatio: 1,
child: CachedNetworkImage(
imageUrl:
'${_productosModel[index].image}' +
'?alt=media',
fit: BoxFit.cover,
placeholder: (_, __) {
return Center(
child:
CupertinoActivityIndicator(
radius: 15,
));
}),
),
),
),
],
);
},
))
],
),
Container(height: 3.0, color: Colors.grey),
SizedBox(
height: 5.0,
),
Container(
color: Colors.grey[300],
height: MediaQuery.of(context).size.height / 1.5,
child: GridView.builder(
padding: const EdgeInsets.all(4.0),
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2),
itemCount: _productosModel.length,
itemBuilder: (context, index) {
final String imagen = _productosModel[index].image;
var item = _productosModel[index];
return Card(
elevation: 4.0,
child: Stack(
fit: StackFit.loose,
alignment: Alignment.center,
children: <Widget>[
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(
child: CachedNetworkImage(
// THIS IS THE IMAGE I NEED TO LOOK BIG WHEN I CLICK
imageUrl:
'${_productosModel[index].image}' +
'?alt=media',
fit: BoxFit.cover,
placeholder: (_, __) {
return Center(
child:
CupertinoActivityIndicator(
radius: 15,
));
}),
),
Text(
'${_productosModel[index].name}',
textAlign: TextAlign.center,
style: TextStyle(fontSize: 20.0),
),
SizedBox(
height: 15,
),
Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: <Widget>[
SizedBox(
height: 25,
),
Text(
'${_productosModel[index].price.toString()}COP',
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20.0,
color: Colors.black),
),
Padding(
padding: const EdgeInsets.only(
right: 8.0,
bottom: 8.0,
),
child: Align(
alignment: Alignment.bottomRight,
child: GestureDetector(
child: (!_listaCarro
.contains(item))
? Icon(
Icons.shopping_cart,
color: Colors.yellow[800],
size: 38,
)
: Icon(
Icons.shopping_cart,
color: Colors.red,
size: 38,
),
onTap: () {
setState(() {
if (!_listaCarro
.contains(item))
_listaCarro.add(item);
else
_listaCarro.remove(item);
});
},
),
),
),
],
)
],
),
],
));
},
)),
],
),
)),
));
}
}

Answer 1

Another solution is to show the larger image on the same screen using the dialog below.
InkWell(
onTap: () => showDialog(
builder: (BuildContext context) => AlertDialog(
backgroundColor: Colors.transparent,
insetPadding: EdgeInsets.all(2),
title: Container(
decoration: BoxDecoration(),
width: MediaQuery.of(context).size.width,
child: Expanded(
child: Image.network(
'${_productosModel[index].image}' +
'?alt=media',
fit: BoxFit.fitWidth,
),
),
),
),
context: context),
child: ClipRRect(
borderRadius: BorderRadius.circular(8),
child: Image.network(
BaseUrl.host + posts!.imageUrl!,
fit: BoxFit.cover,
),
),
)

Answer 2

You can create a new page, wrap the image widget in a InkWell widget, and when tapped navigate to the new page showing the image.
EDIT:
Your widget image would become:
// THIS IS THE IMAGE I NEED TO LOOK BIG WHEN I CLICK
return InkWell(
onTap: () => Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) => ImageScreen(
url: '${_productosModel[index].image}' + '?alt=media',
),
),
),
child: Expanded(
child: CachedNetworkImage(
imageUrl: '${_productosModel[index].image}' + '?alt=media',
fit: BoxFit.cover,
placeholder: (_, __) {
return Center(
child: CupertinoActivityIndicator(
radius: 15,
),
);
},
),
),
),
And then you create a new stateless widget which it builds a:
import 'package:flutter/material.dart';
class ImageScreen extends StatelessWidget {
final String? url;
ImageScreen({
Key? key,
#required this.url,
}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
child: Expanded(
child: CachedNetworkImage(
imageUrl: '${this.url}',
// Ajust the image changing the box fit attributte
fit: BoxFit.cover,
placeholder: (_, __) {
return Center(
child: CupertinoActivityIndicator(
radius: 15,
),
);
},
),
),
);
}
}
After that when you click the app navigates to a new screen rendering only the image. You can add a back button later.