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+1environment: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: ^0.1.2dev_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 {@overrideWidget 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: <Widget>[new Expanded(child:Image.asset("images/1.jpg",width:500,height:50) ,),new Expanded(child:Image.asset("images/2.jpg",width:500,height:100) ,)],)));}
}

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