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Flutter – How to add multiple children in a body

I am new to Dart and I am currently stuck on how to add multiple children in a body. Right now I need to add 4 children in a body and I do not know what to do.

I have tried this:

This is my body:

body: Column(
    children: [
      LinkBox(), // Add the link box here
    Expanded(child: MyHomePage()),
    ],
  ),

I need to add the following children into my body:

  1. LinkBox()
  2. MyHomePage()
  3. ShoppingItem()
  4. ShoppingGallery()

I have tried to do this:

body: Column(
    children: [
      LinkBox(), // Add the link box here
    Expanded(child: MyHomePage()),
    Expanded(child: ShoppingItem()),
    Expanded(child: ShoppingGallery()),
    ],
  ),

Also tried to do this:

body: Column(
    children: <Widget>[
      LinkBox(), // Add the link box here
     MyHomePage(),
    ShoppingItem(),
     ShoppingGallery(),
    ],
  ),

And also this:

body: Column(
    children: <Widget>[
      LinkBox(), // Add the link box here
      Expanded(child: MyHomePage()),
    Expanded(child: ShoppingItem()),
    Expanded(child: ShoppingGallery()),
    ],
  ),

It resulted with a lot of problems and I could not run the code on DartPad.

I want it to look like this:

image 1

with this below:

image 2

These are the problems that dart pad resulted in:

1st problem
2nd problem
3rd problem

Tags:

2

Answers


  1. 0

    As in error message, your widgets ShoppingItem and ShoppingGallery have required parameters which you did not provide, those are name, priceRange and rating. You are unable to build Flutter/Dart app without required parameters. Please read https://dart.dev/language/classes to know more about how classes work in dart (Widgets are essentially dart classes)

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  2. 0 
    class ShoppingItem {
  
  String name;
  int priceRange;
  double rating;
  
  ShoppingItem({required this.name,required this.priceRange,required this.rating});
}

  class ShoppingGallery {
  
  String name;
  int priceRange;
  double rating;
  
  ShoppingGallery({required this.name,required this.priceRange,required this.rating});
}

void main() {
  ShoppingItem _item1 = ShoppingItem(name:"Dog",priceRange: 500,rating: 4.5);
  ShoppingItem _item2 = ShoppingItem(name:"Cat",priceRange: 300,rating: 3.5);
  
  List<ShoppingItem> _shoppingItems = [_item1,_item2];  
  
  ShoppingGallery _galleryItem1 = ShoppingGallery(name:"Toy",priceRange: 100,rating: 5);
  ShoppingGallery _galleryItem2 = ShoppingGallery(name:"Sweets",priceRange: 200,rating: 2);
  
  List<ShoppingGallery> _galleryItems = [_galleryItem1,_galleryItem2];  
  
  print(_shoppingItems); // [Instance of 'ShoppingItem', Instance of 'ShoppingItem']
  print(_galleryItems); // [Instance of 'ShoppingGallery', Instance of 'ShoppingGallery']`enter code here`
}
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