Flutter入门学习--(18)添加本地资源图片

开发过程中，有些图片是要放到本地资源文件中，然后本地加载，这样做需要两个步骤就可以实现

1.创建本地资源文件夹Images,然后添加图片 1.jpg,  2.jpg

2.配置pubspec.yaml 中的资源路径，必须配置，如果不配置，在程序中图片就会加载不出来

3.使用 Image.asset("images/1.jpg",width:500,height:50) 加载图片

 

  pubspec.yaml配置

name: demoone
description: A new Flutter project.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# Read more about versioning at semver.org.
version: 1.0.0+1

environment:
  sdk: ">=2.0.0-dev.68.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# 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/1.jpg
   - images/2.jpg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.io/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.io/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.io/custom-fonts/#from-packages

 

   程序代码

  

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Positioned布局控件',
        home: Scaffold(
            appBar: AppBar(
              title: Text("Flutter资源图片"),
            ),
            body: new Column(
              mainAxisAlignment: MainAxisAlignment.start,
             children: [
               new Expanded(
                 child:Image.asset("images/1.jpg",width:500,height:50) ,
               ),
                new Expanded(
                 child:Image.asset("images/2.jpg",width:500,height:100) ,
               )
                 
            
               
       
             ],

            )));
  }
}