Dynamic content PageView is not working in flutter - flutter

Question

I tried to add dynamic content in pageview but the view of pageview is not showing.
class HomeFragment extends StatefulWidget {
#override
_HomeFragmentState createState() => _HomeFragmentState();
}
class _HomeFragmentState extends State<HomeFragment> {
List<String> pagerItems = new List();
#override
void initState() {
populatePager();
}
void populatePager() {
pagerItems.add(
"https://ecouponshop.com/wp-content/uploads/2016/04/20-848x470.jpg");
pagerItems.add(
"https://rukminim1.flixcart.com/flap/960/960/image/eb7785.jpg?q=50");
pagerItems.add(
"https://zamroo.s3.ap-south-1.amazonaws.com/images/product-images/home-garden/washing-machines/medium/20170803092151-23218.jpg");
setState(() {
pagerItems;
});
}
#override
Widget build(BuildContext context) {
return Container(
height: double.infinity,
child: Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Container(
height: 200.0,
child: pager(),
)
],
),
),
);
}
Widget pager() {
return PageView.builder(
itemCount: pagerItems.length,
physics: BouncingScrollPhysics(),
itemBuilder: (BuildContext context, int index) {
pagerBody(context, index);
});
}
}

Answer 1

There are couple of mistakes in your code, like you forgot super.initState(), you were not returning any widget from itemBuilder. And you were unnecessarily using pager.items inside setState. Here is the correct code.
class HomeFragment extends StatefulWidget {
#override
_HomeFragmentState createState() => _HomeFragmentState();
}
class _HomeFragmentState extends State<HomeFragment> {
List<String> pagerItems = new List();
#override
void initState() {
super.initState(); // you forgot this
populatePager();
}
void populatePager() {
setState(() {
pagerItems.add("https://ecouponshop.com/wp-content/uploads/2016/04/20-848x470.jpg");
pagerItems.add("https://rukminim1.flixcart.com/flap/960/960/image/eb7785.jpg?q=50");
pagerItems.add("https://zamroo.s3.ap-south-1.amazonaws.com/images/product-images/home-garden/washing-machines/medium/20170803092151-23218.jpg");
});
}
#override
Widget build(BuildContext context) {
return Container(
height: double.infinity,
child: Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Container(
height: 200.0,
child: pager(),
)
],
),
),
);
}
Widget pager() {
return PageView.builder(
itemCount: pagerItems.length,
physics: BouncingScrollPhysics(),
itemBuilder: (BuildContext context, int index) {
return pagerBody(context, index); // you forgot this
},
);
}
}