Navigator.push() shows a Black Screen - flutter

Question

I am trying to make a fruithero flutter app but while changing my main page to another page, It shows only a black screen on my android emulator in laptop and on my phone, but in https://flutlab.io/ it shows perfectly, What is the problem that the app is not working on local emulator or in my phone but working on online IDE
Showing an Eror like this: -
There are multiple heroes that share the same tag within a subtree.
main.dart
import 'package:flutter/material.dart';
import './detailsPage.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
debugShowCheckedModeBanner: false,
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFF21BFBD),
body: ListView(
children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 15.0, left: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(
icon: Icon(Icons.arrow_back_ios),
color: Colors.white,
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DetailsPage(),
),
);
},
),
Container(
width: 125.0,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(
icon: Icon(Icons.filter_list),
color: Colors.white,
onPressed: () {},
),
IconButton(
icon: Icon(Icons.menu),
color: Colors.white,
onPressed: () {},
),
],
),
),
],
),
),
SizedBox(
height: 25.0,
),
Padding(
padding: EdgeInsets.only(left: 40.0),
child: Row(
children: <Widget>[
Text(
'Healthy',
style: TextStyle(
fontFamily: 'Mont',
color: Colors.white,
fontSize: 25.0,
fontWeight: FontWeight.bold),
),
SizedBox(width: 10.0),
Text(
'Food',
style: TextStyle(
fontFamily: 'Mont', color: Colors.white, fontSize: 25.0),
),
],
),
),
SizedBox(
height: 40.0,
),
Container(
height: MediaQuery.of(context).size.height - 185.0,
decoration: BoxDecoration(
color: Colors.white,
borderRadius:
BorderRadius.only(topLeft: Radius.circular(75.0))),
child: ListView(
primary: false,
padding: EdgeInsets.only(left: 25.0, right: 20.0),
children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 45.0),
child: Container(
height: MediaQuery.of(context).size.height / 1.68,
child: ListView(
children: <Widget>[
_buildFoodItem('images/one.png', 'Salmon', '\$24.0'),
_buildFoodItem('images/two.png', 'Spring', '\$22.0'),
_buildFoodItem('images/three.png', 'Sprite', '\$34.0'),
_buildFoodItem('images/one.png', 'Mut', '\$12.0')
],
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
height: 65.0,
width: MediaQuery.of(context).size.width / 6,
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey,
style: BorderStyle.solid,
width: 1.0,
),
borderRadius: BorderRadius.circular(20)),
child: Center(
child: Icon(
Icons.search,
color: Colors.black,
),
),
),
Container(
height: 65.0,
width: MediaQuery.of(context).size.width / 6,
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey,
style: BorderStyle.solid,
width: 1.0,
),
borderRadius: BorderRadius.circular(20)),
child: Center(
child: Icon(
Icons.shopping_cart,
color: Colors.black,
),
),
),
Container(
height: 65.0,
width: MediaQuery.of(context).size.width / 2,
decoration: BoxDecoration(
color: Color(0xff170F1F),
border: Border.all(
color: Colors.grey,
style: BorderStyle.solid,
width: 1.0,
),
borderRadius: BorderRadius.circular(20)),
child: Center(
child: Text(
'Checkout',
style: TextStyle(
fontSize: 18.0,
color: Colors.white,
fontFamily: 'Mont',
),
)),
),
],
),
],
),
),
],
),
);
}
Widget _buildFoodItem(String imgPath, String foodName, String price) {
return Padding(
padding: EdgeInsets.only(left: 10.0, right: 10.0, top: 10.0),
child: InkWell(
onTap: () {
Navigator.push( //Here is the Navigator.push()
context,
MaterialPageRoute(builder: (BuildContext context) {
return DetailsPage();
}),
);
},
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
child: Row(
children: [
Hero(
tag: imgPath,
child: Image(
image: AssetImage(imgPath),
fit: BoxFit.cover,
height: 75.0,
width: 75.0,
),
),
SizedBox(width: 10.0),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
foodName,
style: TextStyle(
fontFamily: 'Mont',
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
Text(
price,
style: TextStyle(
fontFamily: 'Mont',
fontSize: 15.0,
color: Colors.grey),
)
],
),
],
),
),
IconButton(
icon: Icon(Icons.add),
color: Colors.black,
onPressed: () {},
),
],
),
),
);
}
}
Navigator.push code is like this:
Navigator.push(
context,
MaterialPageRoute(builder: (BuildContext context) {
return DetailsPage();
}),
);
detailsPage.dart
import 'package:flutter/material.dart';
class DetailsPage extends StatefulWidget {
#override
_DetailsPageState createState() => _DetailsPageState();
}
class _DetailsPageState extends State<DetailsPage> {
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFF7A9BEE),
appBar: AppBar(
leading: IconButton(
onPressed: () {
Navigator.of(context).pop();
},
icon: Icon(Icons.arrow_back_ios),
color: Colors.white,
),
backgroundColor: Colors.transparent,
elevation: 0.0,
title: Text(
'Details',
style: TextStyle(
fontFamily: 'Mont',
fontSize: 18.0,
color: Colors.white,
),
),
centerTitle: true,
actions: <Widget>[
IconButton(
icon: Icon(Icons.more_horiz),
onPressed: () {},
color: Colors.white,
),
],
),
);
}
}
Here is git Repository link: 1

Answer 1

i dont see the hero widget in the detailsPage.dart, when you set up a Hero widget in main and Navigate to detailsPage, you have to set up a hero widget to receive a hero transition from the main page, and because you have a listView in main you have to give a dynamic tag to each list item because each hero must have a tag associated with it so when it transfer to different layout it knows which hero to transit to it,
you already set up a hero tag in main page and you already give it a tag as tag: imgPath
tag is like an id for that hero, now you need to set the same tag (id) in the detailsPage,
please watch this to understand the logic Hero Flutter Widget

Answer 2

You should use Hero Widgets on both screens.
I couldn't find the Hero widget, nor the tag and not the image that you used on your first screen too (AssetImage(imgPath))
Try and parameterize using the propoer Hero specs.
Here you can find an good example and instructions: Flutter example