Flutter how to print value pass through screen?

Question

I am passing value between 2 screens I need to know how can I simply print value?

This is how I am sending value

onTap: () {
      Navigator.push(
        context,
            MaterialPageRoute(
                 builder: (_) => ViewPostScreen(
                   id: id,
                  ),
                 ),
               );
            },

This is my second page

class ViewPostScreen extends StatefulWidget {
  final int id;
  ViewPostScreen({Key key, @required this.id}) : super(key: key);

  @override
  _ViewPostScreenState createState() => _ViewPostScreenState();
}

class _ViewPostScreenState extends State<ViewPostScreen> {
}

I need to print the value of id in _ViewPostScreenState I try with simple print but showing error anyone can help?

post error message

user10539074
– user10539074

2020-04-09 12:37:13 +00:00
Commented Apr 9, 2020 at 12:37 — user10539074
– user10539074, Commented Apr 9, 2020 at 12:37

CopsOnRoad · Accepted Answer · 2020-04-09 12:41:53Z

1

The problem is you are not using print inside a method rather at the class level. Create a method and then use print inside it.

void method() {
  print(...);
}

Full solution:

class ViewPostScreen extends StatefulWidget {
  final int id;
  ViewPostScreen({Key key, @required this.id}) : super(key: key);

  @override
  _ViewPostScreenState createState() => _ViewPostScreenState();
}

class _ViewPostScreenState extends State<ViewPostScreen> {
  void method() {
    print(widget.id);
  }
}

answered Apr 9, 2020 at 12:41

CopsOnRoad

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5 Comments

Umaiz Khan Over a year ago

can I use this method in _ViewPostScreenState?

CopsOnRoad Over a year ago

Yes, you can, I just added full solution. Please take a look.

user10539074 Over a year ago

actually he doesn't need to create method method to access widget.id from state class as mentioned in your answer

CopsOnRoad Over a year ago

Yes you're right, he can do that inside any method, I just created a standalone method to make things look easy.

Umaiz Khan Over a year ago

Thanks. also, I need to call a method in initState(). Thanks again

ifredom · Accepted Answer · 2020-04-09 12:38:28Z

0

onTap: () {
      Navigator.push(
        context,
            MaterialPageRoute(
                 builder: (_) {
print(id); // print here
                      return ViewPostScreen(
                       id: id,
                      );
                   }
                 ),
               );
            },

answered Apr 9, 2020 at 12:38

ifredom

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1 Comment

Umaiz Khan Over a year ago

need to print on other page

wxker · Accepted Answer · 2020-04-09 12:51:36Z

0

You can access the widget's attributes from the State using widget

print(widget.id.toString());

You cannot call the print function in the class body. It needs to be within a function. You can use initState as it is the first function that runs.

void initState() {
    super.initState();
    print(widget.id.toString());
}

Note that you will also need a build method in your State class

edited Apr 9, 2020 at 12:51

answered Apr 9, 2020 at 12:41

wxker

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