Je ne peux pas avoir une image flottante

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - images

J'ai créé un GitHub repo pour cela, veuillez suivre la même structure de fichiers, cela devrait fonctionner!

vous devez mentionner les images dans pubspect.yaml pour les utiliser dans le projet, comme ci-dessous.

 Image.asset('images/1.jpg')

alors vous pouvez utiliser une image comme celle-ci,

flutter:
  assets:
  - assets/1.jpg

Remarque: - assurez-vous que votre image se trouve dans le dossier nommé " images "

import 'package:flutter/material.dart';
import 'package:kwanjai_next/constants/kwanjai_color.dart';

void main() => runApp(MaterialApp(
  debugShowCheckedModeBanner: false,
  title: 'GridView',
  home: ProjectTest(),
)); // MaterilApp

class ProjectTest extends StatefulWidget{
   @override
  ProjectTestState createState() => new ProjectTestState();
}

class ProjectTestState extends State<ProjectTest>{
 @override
  Widget build(BuildContext context){
    return Scaffold(
      appBar: AppBar(
        backgroundColor: KwanjaiColors.greenst,       
        title: Text('Project t'),
      ),
      body: Container(
        child: ProjectList(),
      ),

    );
  }
}

class ProjectList extends StatefulWidget{
 @override
  ProjectListState createState() => new ProjectListState();
}

class ProjectListState extends State<ProjectList>{
  final list_item = [
    {
      "name" : "image 1",
      "picture" : "assets/1.jpg",
      "price" : 70,
      "old_picture" : 90
    },
        {
      "name" : "image 2",
      "picture" : "assets/2.jpg",
      "price" : 40,
      "old_picture" : 30
    },
        {
      "name" : "image 3",
      "picture" : "assets/3.jpg",
      "price" : 30,
      "old_picture" : 100
    },
        {
      "name" : "image 4",
      "picture" : "assets/4.jpg",
      "price" : 50,
      "old_picture" : 90
    },
        {
      "name" : "image 5",
      "picture" : "assets/5.jpg",
      "price" : 40,
      "old_picture" : 80
    },
        {
      "name" : "image 6",
      "picture" : "assets/6.jpg",
      "price" : 10,
      "old_picture" : 20
    },
        {
      "name" : "image 7",
      "picture" : "assets/1.jpg",
      "price" : 70,
      "old_picture" : 90
    },
        {
      "name" : "image 8",
      "picture" : "assets/2.jpg",
      "price" : 40,
      "old_picture" : 30
    },
        {
      "name" : "image 9",
      "picture" : "assets/3.jpg",
      "price" : 30,
      "old_picture" : 100
    },
        {
      "name" : "image 10",
      "picture" : "assets/4.jpg",
      "price" : 50,
      "old_picture" : 90
    },
        {
      "name" : "image 11",
      "picture" : "assets/5.jpg",
      "price" : 40,
      "old_picture" : 80
    },
        {
      "name" : "image 12",
      "picture" : "assets/6.jpg",
      "price" : 10,
      "old_picture" : 20
    },
  ]; 
   @override
  Widget build(BuildContext context){
    return GridView.builder( 

      itemCount: list_item.length,
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2), 

      itemBuilder: (BuildContext context, int index){
        return ProjectDetail(
          project_name: list_item[index]['name'],
          project_picture: list_item[index]['picture'],
          project_price: list_item[index]['price'],
          project_old: list_item[index]['old_picture'],
        );
      }
    );
  }
}

class ProjectDetail extends StatelessWidget{
  final project_name;
  final project_picture;
  final project_price;
  final project_old;

  ProjectDetail({this.project_name,this.project_picture,this.project_price,this.project_old});
  @override
  Widget build(BuildContext context){
    return Card(
      child: Hero(tag: project_name,
       child: Material(
         child: InkWell(
           onTap: (){},
           child:  GridTile(
             child:  Image.asset('assets/1.jpg'),

           ),
         ),
       ),),
    );
  }
}

Créez un dossier dans le répertoire principal du projet appelé assets, et à l'intérieur créez un dossier appelé images. Au dossier images, ajoutez l'image appelée 1.jpg. Dans votre pubspec.yaml:

 Image.asset('assets/images/1.jpg')

ou pour ajouter tout le répertoire d'images:

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/images/

Dans votre code:

# The following section is specific to Flutter.
flutter:
  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/images/1.jpg