How to implement multiple horizontal lists inside a column - flutter

Question

I want to implement multiple horizontal lists that contain cards with some details, and now all i get is just white screens(without errors)
This is my code:
Scaffold(
body: Column(
children: <Widget>[
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 50,
itemBuilder: (BuildContext context, int index) {
Card(
child: Column(
children: <Widget>[
Text('fsfssffs'),
],
),
);
},
),
),
SizedBox(
height: 20.0,
),
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 50,
itemBuilder: (BuildContext context, int index) {
Card(
child: Column(
children: <Widget>[
Text('fsfssffs'),
],
),
);
},
),
),
],
),
);
I want to achieve something like the facebook stories

Answer 1

Use => on List itemBuilder to return the items:
Scaffold(
body: Column(
children: <Widget>[
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 50,
itemBuilder: (BuildContext context, int index) =>
Card(
child: Column(
children: <Widget>[
Text('fsfssffs'),
],
),
);
},
),
),
SizedBox(
height: 20.0,
),
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 50,
itemBuilder: (BuildContext context, int index) =>
Card(
child: Column(
children: <Widget>[
Text('fsfssffs'),
],
),
);
},
),
),
],
),
);

Answer 2

You were not returning any widget from your itemBuilder method which is why you were unable to see anything on screen.
Basically, there are 2 solutions for this, I am giving you idea using a build() method you can do it in your itemBuilder.
(1) Use => (fat arrow notation)
Example:
Widget build(context) => Text("Hi");
(2) Use return.
Widget build(context) {
return Text("Hi");
}